BiomesOPlenty/src/minecraft/biomesoplenty/helpers/BOPLiquidHelper.java

package biomesoplenty.helpers;

import net.minecraft.item.ItemStack;
import net.minecraft.util.MovingObjectPosition;
import net.minecraft.world.World;
import net.minecraftforge.client.event.TextureStitchEvent;
import net.minecraftforge.event.Event.Result;
import net.minecraftforge.event.ForgeSubscribe;
import net.minecraftforge.event.entity.player.FillBucketEvent;
import net.minecraftforge.liquids.LiquidDictionary;
import biomesoplenty.api.Liquids;
import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;

public class BOPLiquidHelper 
{
	@ForgeSubscribe
	@SideOnly(Side.CLIENT)
	public void textureHook(TextureStitchEvent.Post event) 
	{
		LiquidDictionary.getCanonicalLiquid("Spring Water").setRenderingIcon(Liquids.springWaterStill.get().getBlockTextureFromSide(1)).setTextureSheet("/terrain.png");
	}
	
	@ForgeSubscribe
	public void onBucketFill(FillBucketEvent event) 
	{
		ItemStack result = fillCustomBucket(event.world, event.target);

		if (result == null)
		{
			return;
		}

		event.result = result;
		event.setResult(Result.ALLOW);
	}

	public ItemStack fillCustomBucket(World world, MovingObjectPosition pos) 
	{
		int blockID = world.getBlockId(pos.blockX, pos.blockY, pos.blockZ);

		if ((blockID == Liquids.springWaterStill.get().blockID || blockID == Liquids.springWaterFlowing.get().blockID) && world.getBlockMetadata(pos.blockX, pos.blockY, pos.blockZ) == 0) 
		{
			world.setBlock(pos.blockX, pos.blockY, pos.blockZ, 0);

			return new ItemStack(Liquids.bucketSpringWater.get());
		} 
		else
		{
			return null;	
		}
	}
}