If you have a Sam’s or Costco in your area, you can get past the membership by using a gift card. You can also buy a gift card without a membership. Sometimes they’re sticklers about it if you’re there super early, because that’s apparently “special members hour” or some shit, but the worst that happens is they tell you to leave.
If you can save up $15-20 for a 25lb sack of rice, it’ll last about 100-150 meals, which means it’s about 10-20¢ per meal. Just keep it in a plastic container to keep bugs out.
Get some cheap frozen vegetables and bulk, dried beans and you can eat pretty good for like a dollar per day.
Honestly it’s kinda cruel that buying in bulk saves a ton of money, but the people that need it most can’t afford to.