RustyOlRanger4x4:

As txhunter58 indicates, you carry a filter or other means to treat water and then draw it from streams as you need it . . . unless you are backpacking/hunting the desert.

Carry enough water in your pack to quench your thirst during the day of backpacking/hunting. For me this is typically a quart bottle stuffed into an easily accessible outside pocket of my pack. The experts, however, advise that you drink plenty of fluids at altitude to avoid altitude sickness, so maybe it is better to carry two quarts of water.

When you choose a campsite for the night, you will choose a spot close to water. Draw water for cooking and cleaning through your filter as part of cooking operations. In the morning, draw water to fill your water bottles as part of camp breaking operations.

It is much easier on your back to haul dried foods which do not have the water in them and rehydrate them at cooking time than to haul fully hydrated foods. The more day's worth of food you must haul the more critical this consideration becomes. Hauling fully hydrated food on an overnighter would be no big deal. Hauling fully hydrated food for a 7 day trip is a different story.

Be advised that there are parasites in streams, even apparently pure, pristine mountain streams. The giardia parasite, for example, is common in streams in the rocky mountains. I have had giardesis and it isn't fun. Vomiting and diahrea concurrently is a challenge you don't need to experience on a backpacking trip. It left me with an unquenchable thirst and a very low energy level. Treat your water if you are wise.