Missoula is a college town. That means the eating is usually pretty darn good downtown, and reasonably priced.

A Commie He//hole politically. You have my permission NOT to give money to the beggars who will probably approach you after you've eaten, or even before. But you'll eat pretty well.

Really depends on what rivers you are fishing, but I will second the Clark Fork can be a waste, or a real sleeper. I used to routinely fish (but not eat) between Butte and Missoula, depending on where I would camp. Some of it was a complete skunk, other times, I couldn't keep the line slack, usually in spots that don't look fishy at all. But that was before a plague of guides and amenity migrants descended upon our Treasure State.

Up hills slow,
Down hills fast
Tonnage first and
Safety last.