Help! I'm super new and have a ?? ?

Hi everyone. I'm hoping someone can answer a quick ? I'm on day 6 of full liquid before my surgery on 3/26/18 and I'm unexpectedly stranded away from home. A friend asked for a favor and I did t expect to be out so long or be more than 45 minutes from home. I didn't bring enough appropriate/approved liquids with me and will have to stop somewhere to get something. Can anyone tell me what might me safe to eat that won't cause an issue with the whole "shrinking the liver before surgery" deal?