hi alexandria, i think if i was in your situation i would try and find some plain chicken n salad if you have somewhere you can find that nearby or try and split my tetra over the day by having 1/3 topped up with hot water like hot chocolate.
Hope it goes ok for you!
I have done this once or twice and just skipped lunch and then spaced my remaining packs over the evening. You're not going to get hungry, so just have lots to drink and have your packs later. I wouldnt eat just because its 'meal time'.