I am about to take a very low-budget, week-long trip overseas, to London. My plan is to buy some grocery staples to keep at the place where I'm staying, so I don't have to eat in restaurants. I don't want to blow my tiny budget or my WW plan. I'm also going to be on the run a lot so I need food I can take with me. Any ideas? I was thinking of a jar of peanut butter, a loaf of bread, and some apples, which isn't really the best plan so I'm looking for some ideas. Thanks in advance!
EDIT: Oh, I should mention that I'm vegetarian!