You can now soak clouds using bottles of water

src/main/java/com/minelittlepony/unicopia/block/cloud/NaturalCloudBlock.java

@@ -59,6 +59,6 @@ public class NaturalCloudBlock extends PoreousCloudBlock {
             return ItemActionResult.SUCCESS;
         }
 
-        return ItemActionResult.PASS_TO_DEFAULT_BLOCK_INTERACTION;
+        return super.onUseWithItem(stack, state, world, pos, player, hand, hit);
     }
 }

src/main/java/com/minelittlepony/unicopia/block/cloud/PoreousCloudBlock.java

@@ -12,9 +12,15 @@ import com.mojang.serialization.codecs.RecordCodecBuilder;
 
 import net.minecraft.block.BedBlock;
 import net.minecraft.block.BlockState;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.item.ItemStack;
 import net.minecraft.server.world.ServerWorld;
+import net.minecraft.util.Hand;
+import net.minecraft.util.ItemActionResult;
+import net.minecraft.util.hit.BlockHitResult;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.random.Random;
+import net.minecraft.world.World;
 
 public class PoreousCloudBlock extends CloudBlock implements Soakable {
     private static final MapCodec<PoreousCloudBlock> CODEC = RecordCodecBuilder.mapCodec(instance -> instance.group(
@@ -36,6 +42,11 @@ public class PoreousCloudBlock extends CloudBlock implements Soakable {
         return CODEC;
     }
 
+    @Override
+    protected ItemActionResult onUseWithItem(ItemStack stack, BlockState state, World world, BlockPos pos, PlayerEntity player, Hand hand, BlockHitResult hit) {
+        return Soakable.tryDepositMoisture(stack, state, world, pos, player, hand, hit);
+    }
+
     @Nullable
     @Override
     public BlockState getStateWithMoisture(BlockState state, int moisture) {

src/main/java/com/minelittlepony/unicopia/block/cloud/PoreousCloudStairsBlock.java

@@ -11,6 +11,13 @@ import com.mojang.serialization.codecs.RecordCodecBuilder;
 
 import net.minecraft.block.BlockState;
 import net.minecraft.block.StairsBlock;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.Hand;
+import net.minecraft.util.ItemActionResult;
+import net.minecraft.util.hit.BlockHitResult;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.World;
 
 public class PoreousCloudStairsBlock extends CloudStairsBlock implements Soakable {
     private static final MapCodec<PoreousCloudStairsBlock> CODEC = RecordCodecBuilder.mapCodec(instance -> instance.group(
@@ -31,6 +38,11 @@ public class PoreousCloudStairsBlock extends CloudStairsBlock implements Soakabl
         return CODEC;
     }
 
+    @Override
+    protected ItemActionResult onUseWithItem(ItemStack stack, BlockState state, World world, BlockPos pos, PlayerEntity player, Hand hand, BlockHitResult hit) {
+        return Soakable.tryDepositMoisture(stack, state, world, pos, player, hand, hit);
+    }
+
     @Nullable
     @Override
     public BlockState getStateWithMoisture(BlockState state, int moisture) {

src/main/java/com/minelittlepony/unicopia/block/cloud/Soakable.java

@@ -8,10 +8,14 @@ import com.mojang.serialization.Codec;
 
 import net.minecraft.block.Block;
 import net.minecraft.block.BlockState;
+import net.minecraft.component.DataComponentTypes;
+import net.minecraft.component.type.PotionContentsComponent;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.ItemStack;
+import net.minecraft.item.ItemUsage;
 import net.minecraft.item.Items;
 import net.minecraft.particle.ParticleTypes;
+import net.minecraft.potion.Potions;
 import net.minecraft.registry.Registries;
 import net.minecraft.server.world.ServerWorld;
 import net.minecraft.sound.SoundCategory;
@@ -53,15 +57,8 @@ public interface Soakable {
 
     static ItemActionResult tryCollectMoisture(ItemStack stack, BlockState state, World world, BlockPos pos, PlayerEntity player, Hand hand, BlockHitResult hit) {
         if (state.getBlock() instanceof Soakable soakable) {
-            if (stack.getItem() == Items.GLASS_BOTTLE) {
+            if (stack.isOf(Items.GLASS_BOTTLE)) {
-                if (!player.isCreative()) {
+                player.setStackInHand(hand, ItemUsage.exchangeStack(stack, player, Items.POTION.getDefaultStack(), false));
-                    stack.split(1);
-                }
-                if (stack.isEmpty()) {
-                    player.setStackInHand(hand, Items.POTION.getDefaultStack());
-                } else {
-                    player.giveItemStack(Items.POTION.getDefaultStack());
-                }
                 world.playSound(player, player.getX(), player.getY(), player.getZ(), USounds.Vanilla.ITEM_BOTTLE_FILL, SoundCategory.NEUTRAL, 1, 1);
                 world.emitGameEvent(player, GameEvent.FLUID_PICKUP, pos);
                 updateMoisture(soakable, state, world, pos, soakable.getMoisture(state) - 1);
@@ -70,6 +67,23 @@ public interface Soakable {
             }
         }
 
+        return tryDepositMoisture(stack, state, world, pos, player, hand, hit);
+    }
+
+    static ItemActionResult tryDepositMoisture(ItemStack stack, BlockState state, World world, BlockPos pos, PlayerEntity player, Hand hand, BlockHitResult hit) {
+        if (state.getBlock() instanceof Soakable soakable) {
+            if (soakable.getMoisture(state) < 7
+                    && stack.isOf(Items.POTION)
+                    && stack.getOrDefault(DataComponentTypes.POTION_CONTENTS, PotionContentsComponent.DEFAULT).matches(Potions.WATER)) {
+                player.setStackInHand(hand, ItemUsage.exchangeStack(stack, player, Items.GLASS_BOTTLE.getDefaultStack(), false));
+                world.playSound(player, player.getX(), player.getY(), player.getZ(), USounds.Vanilla.ITEM_BUCKET_EMPTY, SoundCategory.NEUTRAL, 1, 1);
+                world.emitGameEvent(player, GameEvent.FLUID_PLACE, pos);
+                updateMoisture(soakable, state, world, pos, soakable.getMoisture(state) + 1);
+
+                return ItemActionResult.SUCCESS;
+            }
+        }
+
         return ItemActionResult.PASS_TO_DEFAULT_BLOCK_INTERACTION;
     }