Have a list of all your expenses for the month. Have savings account and regularly save. Be frugal. Avoid discounts and sales on malls.
It is easy to say that but it is really hard. I am okay with the list you stated but I am sure you will be frustrated after you find out all the expenses you made on your list. I have done it and since then I do not do it anymore. It turned out that I needed an extra income because of the result I saw.
Just take note of that important things that needs for spendings e.g bills, foods and any other basic needs.
Misc things will take care later depends on the remaining money. If there's a case that people reached the insufficient ammo status then maybe maximizing the source of income will be great.