Discussion break

I am taking a break today to discuss meal planning.  Should I plan meals in advance daily, weekly, bi-weekly, or monthly?  Maybe I could do so monthly as I go shopping once a month?  There are so many strategies I could work with.  There are only 2 people I have to shop for but we have many different interests.  That is the problem plus I am bad at following a budget.  I could use a little guidance.