Well I wouldn't say MT is the perfect scenario. Anyone who lives west of the Mississippi River and/or in the upper Great Lakes needs to know what their area can throw at them.
There's the east side (east of the Continental Divide) part with it's open high prairie that's different than the West Side/East side from Yellowstone NP to the west.
MT West-side Winter scenario
- Clothing = layering with synthetic baselayer & mid-layers, + wind-shell upper & lower, balaclava, liner gloves, insulated mittens/gloves. Smartwool socks. Insulated boots not too tight.
- Sunglasses
- Medium-sized backpack with water bladder
- Water + Water-filter (creeks will still have flowing water even with ice)
- Handwarmers
- Energy bars
- Hydration mix
- Standard survival items - fire starter, whistle, signal mirror
- Map(s) (hardcopy of course)
Again this this post is intentionally vague a scenario is really dependent on where you live & what time of the year it is. Plus there are times when the weather is too bad to go anywhere but people do, and get into trouble.
I would say another scenario would be west Texas, Arizona and New Mexico in the middle of the summer.
BTW if you want to get found fast buy & carry a sat phone.