How do I make a hunger system (No blocks)

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Use this guide:

How to make a breath metre

Good morning! Today, I will be showing you how to make a breath meter in Gimkit! This is a slightly harder guide, so experiment with the game before attempting this. Basic knowlege of channels and wires will be needed to make this device system. (Or just jump right in, I can’t stop you…) PART 1: CREATING THE UNDERWATER PART This section is fairly easy. The main gist of it is to take away an item representing their breath, and kill them when they run out of it. Step 1: Place down some water. T…

And just use blueberries or something to represent food. No blocks needed.
Also sorry for no pictures. If you need help understanding something feel free to ping me.