It sure wouldn't be comfortable for her, that is true. When you wrote "water bottle," I was thinking of the liter size, and that is way wide. I've had a baby and it wouldn't be comfortable for me.
Hi Kid, I think you need to find yourself an older women, I think your find there be gagging for a young stud like you, so that puts you around 7 to 8 inchs circumference, boy that is some p***s for one so young, and its still growing, Theres a saying in the UK Big man big p***s little man all p***s, big womne big f***y little women all f***y, Now I know from reading a lot this last bit rings very true, so look out for an older small framed women, and your away.
Good Luck