The food is not on the game anywhere and its hardcoded.
Even if you manage to include a dial indicating the amount of food left, the game will not end if the food end. It will just end, means nothing. We would need the SDK from ubisoft to include new features like this one.
The only thing you could possibly do is to replace the CO2 dial for a food dial and configure the oxigen to decay even surfaced, and slow down the time for it to decay, lets say, 30 days. It would perfectly simulates food quantity and would even cause a deathscreen in the end. But again, I'm not 100% sure that you could edit the CO2 to decrease while surfaced. If you manage to do that, great, but I honestly think this is hardcoded as well.
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To each his own
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