Until recently, when I rarely made a hot drink and mainly boiled water for dehydrated meals I almost exclusively used the Evernew short wide 600 (excellent pot) with a Sidewinder cone. Now that I more often make a coffee and also simmer meals I've found, like Cathy, that the Toaks 700 is better for those purposes (significantly more usable volume while still being quite wide but less shallow), even it the lid is very annoying (at least on mine; I modified it so it does not flip so easily). Sometimes I use the Toaks 650 light as it pours a bit easier over a coffee filter. Overall I tend to need about 600ml water (~300 for coffee and the remaining 300ml for simmering the meal, which is at the limit of these pots really but in practice it is not much inconvenience to top up the water slightly after making the coffee). I do have a 900ml pot but don't often use that (probably easier to eat out of the other pots). Another factor to consider is that if you are trying to estimate water volume from the pot alone the very wide shallow pots like the Evernew 600 are more difficult.