2 possibilities with the Goose Feet:
--Get just the waterproof shells (they need to be seam-sealed) and wear over a pair of dry socks.
--Get both booties and shells and forget the socks--definitely warmer.
However, it appears that the Goose Feet owner is gone until Aug. 20. IMHO, Goose Feet are well worth waiting for! The homemade alternatives above or a pair of Sprint Aquatics mesh shoes should last you until then. BTW, I used the Sprint Aquatics for camp shoes for several years before Goose Feet came along, and they worked just fine. Unless I scuffed around in the dirt, my sleeping socks stayed clean.
This thread has brought up an issue with the Five Fingers shoes that those interested in such shoes should consider--the problem of keeping feet warm and dry in camp!