@defd2000 I just learned that a community center near me has a fitness center with weights that we can use for free. They do have a schedule of when we can go in and the weights are pretty basic, but I think it's enough for me. It looks like they have dumbbells that go up to maybe 60 pounds, a Smith machine, barbell, bench press and weight plates that go up to 30lbs. Not the best if you want to be a power lifter but I think it's enough for the average person to build strength. See if a community center near you has something similar for free.
If you want to stay at home you can buy resistance bands that are pretty affordable. Even water jugs can provide some resistance if you're just starting out and don't want to spend too much money now.
As for food, I don't think you need to get too fancy about what you eat as long as you're hitting your macros. I get my protein mostly from beans, canned tuna, ground turkey, eggs, frozen fish, chicken thighs, sausage, steak if it's on sale, tofu, edamame, lentils. I do have some protein powder but I don't use it that much. Just one scoop into my overnight oats and casein at night.
I don't have an exact number of how much I spend. Gym for krav maga and striking is $175/month, I strength train at home right now for the most part, groceries if I had to guess $300-400/month? I spend about $60/week on groceries and then I'll go to Costco about once every couple weeks and spend $300 each time I go but it isn't all on groceries. I almost never eat out and I barely drink now and I have no kids, so I'm comfortable with how I'm spending.