I don’t meal prep. I prefer not to spend much time cooking. Most of my vegetable intake is from salad bars, same for meat actually. I could live off Whole Foods. I also eat things like sardines and tuna, which don’t require cooking either. Other than making eggs or the occasional soup or pasta, I really don’t cook anything at all. With fasting, I actually spend less money on food even though I get a lot of prepared/ready to eat things. Also, I don’t have to worry about things going bad before I eat them.
Those are quite long fasts. You’d have to be really on top of your electrolytes (which you very well might be!). I personally think repeated fasts of that length would be detrimental to your health, but I’m not a medical professional in anyway way. I know you want results and to save money, the shorter fasts are probably helping with this. Could you meal prep less meals instead of resorting to repeated long fasts?