PotionList

package com.author.example.lists;

import com.author.example.Main;
import net.minecraft.item.Item;
import net.minecraft.potion.*;
import net.minecraftforge.fml.RegistryObject;
import net.minecraftforge.fml.common.ObfuscationReflectionHelper;
import net.minecraftforge.registries.DeferredRegister;
import net.minecraftforge.registries.ForgeRegistries;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class PotionList {

    public static final DeferredRegister<Effect> EFFECTS = DeferredRegister.create(ForgeRegistries.POTIONS, Main.MOD_ID);

    public static final RegistryObject<Effect> MOD_POTION_EFFECT = EFFECTS.register("mod_potion", () -> new ModPotionEffect(EffectType.BENEFICIAL, 0xabd84e));


    public static final DeferredRegister<Potion> POTIONS = DeferredRegister.create(ForgeRegistries.POTION_TYPES, Main.MOD_ID);

    public static final RegistryObject<Potion> MOD_POTION = POTIONS.register("mod_potion", () -> new Potion(new EffectInstance(MOD_POTION_EFFECT.get(), 600)));

            //.addAttributesModifier(SharedMonsterAttributes.MAX_HEALTH,
            //"", (double)0.5f, AttributeModifier.Operation.MULTIPLY_TOTAL)

    private static Method brewing_mixes;

    private static void addMix(Potion start, Item ingredient, Potion result) {
        if (brewing_mixes == null) {
            brewing_mixes = ObfuscationReflectionHelper.findMethod(PotionBrewing.class, "addMix", Potion.class, Item.class, Potion.class);
            brewing_mixes.setAccessible(true);
        }

        try {
            brewing_mixes.invoke(null, start, ingredient, result);
        } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e){
            e.printStackTrace();
        }
    }

    public static void addBrewingRecipes() {
        addMix(Potions.AWKWARD, ItemList.MOD_BERRIES.get(), MOD_POTION.get());
    }

    public static class ModPotionEffect extends Effect {

        public ModPotionEffect(EffectType typeIn, int liquidColorIn) {
            super(typeIn, liquidColorIn);
        }
    }
}