Provided that you cook, you can technically sustain with around 10 bucks per day (and need to be able to stomach chicken only lol).

If you buy those chicken breast or fillet, can get about 500g for about 7 bucks if i remember correctly. (have not been cooking). ingredients to cook etc with rice (also cook yourself) should bring to about 10 bucks.

500g of chicken breast already have more than 100g of protein already so good enough for standard weightloss diet