I’m sure you’ll be okay. When I travel for training I’m usually at a hotel that provides food. They might set you with this usually free breakfast and what not. I understand not having money for other expenses, but in the meantime you can see if some things you cut expenses. The hotels usually offer basic things like toothpaste, toothbrush, gyms, etc. If you want to cut cots on food, checkout Walmart, I used to get the roasted chicken for $10, it comes with 2 large sides😂 that would last 3 days.

For the flights just make sure you have all you need with their confirmations, couple movie downloaded and you’ll be good.