Best diet for someone who travels a lot?

Hey all, I’m brand new here, actually haven’t even started the challenge yet but am super excited to get going in about a week when things settle down a little in my personal life.

Here’s my question. I travel a lot for work, i travel all over the US and it’s not uncommon for me to be out for a couple of weeks at a time. This means that I end up eating most of my meals out at restaurants. I get per diem for every day I’m on the road to cover my meals and it’s just really not very practical for me to try to buy/travel with groceries, although I’m willing to try it if that’s the only way.

Based on that information, what do y’all think is the best diet for me to choose for 75 Hard? I’m pretty new to dieting overall, I did IIFYM for a little bit like 7 years ago and other than that my wellness routine overall has been pretty lacking. Any advice you guys can give me would be appreciated.