I think i know what's going to help here... You can actually find quite a few water sources besides just melting snow. Summit sodas and stacy's grape sodas are pretty common in buildings and containers, and they'll keep you hydrated in a pinch. Something interesting - toilet tanks in houses and bunkers actually have safe drinking water, though it might feel weird at first.

You'll find basins and sinks in places like the quonset garage, but be careful with those since the water isn't always safe to drink right away. You'll need to boil that stuff or use water purification tablets if you're running low on fuel. While you're searching around, keep an eye out for canned food like peaches or pork and beans, since they'll help with your thirst too.

Just remember that drinking unsafe water can give you dysentery, which is definitely not fun when you're trying to survive. If you're getting dehydrated you'll tire out faster and get cold more easily, so always try to keep some safe water on hand when you can. Might be worth carrying a few purification tablets for emergencies, especially when you can't find fuel to boil water.