It has been decades since I did much winter camping. When I did, I used a small pup tent (nearly a bivy) made of a breathable, closely woven fabric (polyester I think) with a tarp rigged as a Trapazoid above the tent - warm, plenty of dry space for gear & cooking - and He-Dino could water the forest without getting out of the tarp (She-Dino cursed about this frequently <img src="/forums/images/graemlins/grin.gif" alt="" /> ). Never had any condensation issues.