First off, as carnivores will know - after a decent meal, you just do not get hungry that soon. Because your blood sugar doesn't spike and plummet all the time, you don't get that "hangry" feeling either. Hunger, when it comes, is much less emotional, it's just...hunger. So you can go without food for much longer, EASILY. And not be thinking about snacks, either.

McDonalds is a GREAT option. At all the McDonalds I have tried, you can get plain beef patties for cheap. I think it's the cheapest option around, aside from bringing your own food. You will have to get detailed with them, ask to order off the a-la-carte menu, and explain things, but 3 out of 3 times I've tried it, it works.

I've also brought some food with (beef meatballs and a baked egg muffin type dish). It's amazing how calorie dense this type of food is (prepared with enough fat). I can fit a good solid lunch into a tiny little plastic container. I have a little salt container and mini fork, it all fits well together. See the attached photo.

Prep is important. Like I said, I brought quite a bit of food with, in a cooler.

I've eaten in restaurants a couple times now. Once (my partner wanted to eat, I wasn't too hungry), I was able to order some bacon, as a side. It was pretty decent. The other time I was at a restaurant that was not all the great but not cheap either (we went for location). They had a burger on the menu which was the only thing that was reasonable. I asked for the burger, completely plain with just cheese, no fries or buns or veggies. They sent it out with fries. So I had the burger only. It was fine but not satisfying enough, it must have been a lower fat burger instead of the ones that I make, from 20% fat ground beef. Mine are very satisfying, especially if I try to soak up the fat.

I'm still drinking coffee and tea. I always ask for the drink, plain, with heavy whipping cream on the side. Usually I get at least a quarter cup. That's a solid amount of calories - I think it's about 200. Pretty satisfying.