Unlockable Guns and Accessories..
When starting a new level in Career Hunt, look around your cabin before leaving. You should find some form of transportation.
In Wyoming, go to the second location and go across the bridge. Once there, you can climb on top of the mountains and can see all the deer from that spot. You can shoot them with a 30-30 or 30-06. This also works in other places. Note: Do not go down the mountain when the deer is dead or you will die from the fall.
When trying to shoot deer at long range, it is best to try and find a long range rifle such as the 300 BA and pre-test shooting something (like a tree) to see how much you have to compensate for wind and drop.
You can refill your water supply at any watering hole. Stand about waist-high in any body of water when you run out of water. Choose the Hydration Bladder from your inventory. If it reads something like "0 out of 4", choose it. It should fill up automatically.