You can add waterlevel and thirst effect to items/fluids with datapack.

This kind of recipe is used to add water level to itmes/fluids. It's recipe type is "watersource:water_level", and it has six keys.

• group: (String)
  Group of the recipe, same as Vanilla
• ingredient: (Json object)
  A "tag" or an "item", same as Vanilla
• fluid: (String)
  Registry name of a fluid
• nbt: (Json array)
  Same as Vanilla
• mob_effects: (Json array)
  Every json object has three values: name(String), duration(int), amplifier(int)
• water_level: (int)
• water_saturation_level: (int)

These keys is optional.
Game will match a item stack with ingredient, fluid and nbt key. Please write at least one of them.
Game will give Mob Effects of mob_effect key to player when they finish using items.

{
    "type": "watersource:water_level",
    "ingredient": {
        "item": "minecraft:apple"
    },
	"water_level": 2,
	"water_saturation_level": 0
}

This kind of recipe is used to add thist effect to itmes/fluids. It's recipe type is "watersource:thirst", and it has seven keys.

• group: (String)
  Group of the recipe, same as Vanilla
• ingredient: (Json object)
  A "tag" or an "item", same as Vanilla
• fluid: (String)
  Registry name of a fluid
• nbt: (Json array)
  Same as Vanilla
• duration: (int)
• amplifier: (int)
• probability: (int)
  The probability of player get thirst effect

The item matching method of Thirst Recipe is same as WERecipe's.

{
    "type": "watersource:thirst",
    "ingredient": {
        "item": "minecraft:potion"
    },
	"nbt":{
        "Potion":"minecraft:water"
    },
	"duration": 1600,
	"amplifier": 0,
	"probability": 0.75
}