What're you eating that's lower than $3-4 a meal on average? Not trying to sell you on soylent or anything, I'm just legitimately curious
What can't you make for yourself under $4/meal is probably a better question. Sure it costs more than that to actually buy the stuff the first time but when you average out the cost per serving that includes a shit ton of meal options. Just avoid the pre-packaged processed crap that's not actually good for you that is marked up thousands of percent.
Consider chicken breast is $2.36/lb which makes a 4oz serving size only cost $0.59. Chicken thighs instead would cost half that.
A potato is around $0.33 each.
Serving of carrots around $0.20
Serving of lettuce is $0.15
Throw in $0.30 for a serving of seasonings/dressing and you're looking at a traditional american meal for $1.57.
Rice and beans man you can live on that for almost nothing.