It's a bit early to get into the nitty gritty but I do miss living in Fort Collins so I'll share a few of my places to eat and drink. This comes with the caveat that I moved away 2+ years ago so what used to be great, might be meh now.
Old Town food and drink suggestions
Silver Grill Cafe
Cinnamon rolls to die for. End of story. This place is a FoCo institution and deservedly so. If someone tells you to go to the truck stop at Johnson's Corner for cinnamon rolls, they're just wrong. These are the sweetest, most indulgent cinnamon rolls I've ever had... and I've had a lot. So bring your sweet tooth. Solid overall breakfast menu, which is the only time I went there. Closes at 2pm anyhow.
Waffle Lab
I have a problem, I like desert for breakfast. They make a good selection of sweet and savory Belgian waffles.
Choice City Butcher and Deli
Excellent lunch spot, bison Reubens were my jam. Solid beers on taps, typically have some harder to find selections. If you're camping/cooking, great variety of quality local meats.
CopperMuse Distillery
Eclectic selection of drinks made with their own vodka, gin, whiskey, and other spirits. When I was there, they had a decent kitchen for small eats, but don't expect to have a meal. Sit on their patio and people/car watch College Ave.
Prost Brewing
While brewing is based out of their Denver location, these CSU grads decided to set up a satellite location in Old Town. As the name suggests, they specialize in traditional German style beers. Plenty of other places to get your new school IPAs and barrel aged whatever, but here the Kolsch is the perfect beer after a day outside in the summer. A lot of their other beers are solid but never blew me outta the water.
Odell Brewing
It's walking distance in my opinion. While New Belgium often gets most the glory, Odell makes some great beer. Odds are if you live east of the Plains, you haven't had it as they don't distribute nationally. This is what makes it worth a stop if you're into beer.
Non Old Town option
Krazy Karl's Pizza
IMO go to the Elizabeth location as this place deserves to be a college dive pizza bar. Get a pizza with cream cheese on it. They seem to have eliminated my fav, Chicken Bacon Ranch (with spicy ranch). Odds are if you ask for a spicy CBR, someone will know what to make. Often have good beer specials.
I'm sure there's 10+ new breweries around town, but beats me what's good these days.