Example Ugly as Sin food addon. Place in a .pk3 file and load after Ugly as Sin.

zscript.txt

version "4.5"

// Food items that can be directly eaten
class ExampleMod_RedApple : UaS_Consumable {
	default {
		UaS_Consumable.Calories 95; // Calories
		UaS_Consumable.Fluid 85; // Millilitres (remember most non-dehydrated foods have a lot of water in them)
		UaS_Consumable.Bulk 10; // influences number of "bites" it takes to consume foods.
		UaS_Consumable.Description "A medium-sized red apple.";
		// UaS_Consumable.OpenMessage1 ""; // Random messages on opening packaged items
		// UaS_Consumable.OpenMessage2 "";
		// UaS_Consumable.OpenMessage3 "";
		// +UaS_Consumable.PACKAGED; // Food item must be individually opened, like candybars
		// +UaS_Consumable.RESEALABLE; // Food item can be re-sealed, like a water bottle.
		// +UaS_Consumable.DRINKABLE; // Liquid, drunk instead of chewed
		Inventory.PickupMessage "Picked up a red apple";
		tag "Red Apple";
		Inventory.Icon "HSCVA0";  // Same graphic used for inventory icon and pickup sprite
	}
}

// "Container" that gives multiple consumables when opened. 
// Can hold items not in current modlist, for maximum compatibility
class ExampleMod_RedAppleBag : UaS_FoodPackage {
	default {
		UaS_FoodPackage.Description "A bag of red apples.";
		UaS_FoodPackage.OpenMessage1 "These look delicious!"; // Random messages on opening package
		UaS_FoodPackage.OpenMessage2 "Snow White would die for this.";
		UaS_FoodPackage.OpenMessage3 "Are these honeycrisp!?";
		Inventory.PickupMessage "Picked up a bag of apples";
		tag "Bag of Apples";
		Inventory.Icon "HSCVA0";
	}
	override void Contents() {
		AddItem("ExampleMod_RedApple", 5);
	}
}