My parents are going out of town and... i have some questions?

my parents are going to europe for a month and they are the ones who do all grocery shopping and cooking for the house. i normally eat very nice healthy dinners that consists of like fish and vegetables etc. since im working too i dont have alot of time to cook or grocery shop does anyone have a good list of things i should be shoppping for so that i can lose weight and not have to spend alot of time and money on dinner. for example im thinking instant oatmeal for breakfast and lean cuisines (haha i know that sounds gross but at least i wont be ordering delivery pizza) I NEED MORE IDEAS