I'm trying to eat frugally too and healthy organic foods. It's easier, if you don't buy organic.
The most important thing is to make your food from scratch. You can make anything from scratch, even things like crackers or vanilla extract. You can save a lot of money this way and eat healthy because you control the ingredients. This takes time, so you do need to figure out whether it is worth taking time away from money making, like Mturk.
Make sure you eat all your food and don't waste. Try to eat food that will go bad as quickly as possible. Or freeze it if you can. I have a big problem with wasting a lot of food, when my produce goes bad.
Cut back on unnecessary junk foods, especially store bought. You can make sweetened drinks from scratch, like lemonade and iced tea. Also try using your spices to make herbal teas, chai and drinks. I do this all the time. It makes things more exciting.
Another thing I like to do is make sweets from scratch. If you have to make your cookies and cakes from scratch, it makes you appreciate it more. So you may eat less of it. You also have to put more effort and exercise to make it. It also taste better and is healthier than store bought sweets. So you may eat less and get better quality too.