I normally use a "3 cup" pot that actualy holds a bit more than 3 cups. I find for me, solo, it's about right - using an alcohol stove I basically boil a potful in the morning, and this gives me a cup and a half of water or so for my breakfast (oatmeal or dehydrated) - and then the rest is my coffee - Then in the evening I boil another full pot, and that is usually 2 cups into my commercial dehydrated or homemade FBC style meal, and the rest gets made into tea, usually mint

I've tried smaller canpots - and at least for me anything less than 2 cups is really problematic, as often a meal takes 2 cups. I *could* use only 2 cups if I didn't want coffee or tea (or if I wanted to load the stove up again, and boil again). but, well, any fool can be uncomfortable, and I personally don't save enough weight (over my 141 gram 3 cup pot) with anything smaller to justify the inconvenience (or in the case of a lack of morning coffee being not human...)