If you provide the route details I might be able to give you some guidance and/or suggest alternatives.
In advance of that....
Once you are up on the Georgetown Lake plateau, the terrain of MT 1 is pretty level until you get a bit east of Silver Lake. From there, it's basically all down hill to Anaconda. The grade is steepest when you start descending and levels out the closer you get to Anaconda. I have done this portion in the opposite direction twice. Last time was June of last year. I had a slight to moderate headwind both times. The shoulder along Georgetown Lake was narrow in most place and was also a bit chewed up in spots. The further south, the better the shoulder. I rode this on weekdays in late June/early July and the trafffic was pretty minimal. There are some U.S.F.S. campgrounds in the lake area. If you seach Google maps for "Campgrounds near georgetown lake, anaconda, MT" they will show up. The only commerical place I saw between the lake and Anaconda was a marina with a deli. As you are descending you will pass a road that dives down to your right just before a large, reddish brown sign relating the story of a gold strike in the area. Just down that road there is a spring outlet with plumbing for water. It's close enough to the highway that you can walk to it. Came in handy the first time when the day was quite warm.
Anaconda has plenty of places to eat and an Albertson's grocery store next to a pharmacy. As for camping, there is this place:http://www.bigskyrvpark.com/
Wisdom is a very small town. There is a small grocery store that's open until around 5 p.m. or 6 p.m. Selection is somewhat limited. There is no commercial campground, but outside of town on MT 43 there is an Americon Legion or something park where you can camp. Make sure you have bug spray, at least in June. All three times I stayed or passed through there the place was teaming with mosquitoes, hence the screened in shelter at the park. The one time I camped there I pitched my tent inside it. The Nez Perce Motel in town is another option. The Crossings at Fetty's has good food and adult beverages. There is also a dive-looking bar in town.
I might be able to provide more assistance once I see your route plan. For example, if you are going to pass through Philipsburg I have spent two nights there during two different tours. And if you want to add some miles/days, you could ride the Pioneer Mountians Scenic Byway and get to Wisdom from Anaconda the long way through Jackson with a stop at Elkhorn Hot Springs.