Going on trip to california. dont have a lot of $ but just enough to get by. what should i eat/bring to save $

i am bringing $200 for 3 nights and four days. im going with my cl. my mom is paying for the plane ride and the hotel. so all i need is money for food and stuff. my teacher said we are going to a nice restaurant (i'll probably just order a salad and soup or something) i know 200 isnt a lot but im afraid its all i can save before i go. i think i'm going to pack some food with me or buy groceries when im there. im not sure what im giong to do but i need to conserve my money. any suggestions?