Let's see if I can address a couple of your concerns.
1. The night in the field. Are you guys backpacking in and setting up a camp, then hunting from that camp? If so, no big deal, just treat it like a backpacking trip. If there's two of us going, one will carry the tent, the other the stove and fuel. We split the food & water, and keep it as light as possible. Everybody brings their own clothing & personal gear. Again, keep it as light as possible.
If I'm going alone, I may leave the tent behind and just bring a gore-tex bivvy bag or a small tarp to rig over my sleeping bag. Again, a small white-gas backpacking stove is nice, but yeah, a guy can get by with cold chow. Ugh. I'll generally carry the backpacking stove. Hot coffee or a cup of hot soup is very nice in the field.
Backpacking camp with tent - solo hunting trip in the Cascades, Sept 2009:
Backpacking camp without tent - solo hunting trip in the Cascades, Sept 2008:
Or if you're just day hunting and want to be prepared to spend a night if you must - that's different, but nothing that can't be handled with a standard size day pack and a few survival goodies and some decent outdoor clothing, with fleece & gore tex. And some way to make fire.
2. Sidearm. Hmmm. Usually I just don't carry one. I'm already carrying a rifle, much more powerful and more accurate. If I do carry one, it's usually my .44 S&W 629, in a belt holster. I probably don't have a reload with me, but if I do it's a speedloader in a pocket.
Reading your post, I'm picking up a bit of a tactical mindset. Current or prior military? Maybe cop? Or just reading a lot of magazine articles?
Very cool. Spent my time in the USMC infantry and had to de-tune a little on exit. Hunting can, but rarely "goes south." Normally the game is trying very hard to avoid hunters, not to bring the fight to them. That said, bears and other critters can be a bother. I've carried the .44 revolver mostly when in bear country. These danged wolves are another worry now.
Two legged critters can be a problem in some areas. Usually not, but... A sidearm isn't a bad thing - just no need to look like you're getting ready to re-take the hill when going out for a bear hunt. Here's a picture of me on my September bear hunt. Hardly tactical. Just a single shot Ruger rifle with five extra rounds in my shirt pocket.
Not tactical at all, but I was wearing and carrying everything I needed on the hunt. Had a little day pack with me with some water & snacks and a few other odds and ends.