If you used the hint like I told you all you may have found the answer, by putting the other riddles together you would have found the answer was fountain, but if anyone thought it was geyser it would have been correct as well I suppose.
Forever our mouths are open and yet we still whitsle,
Others can hold life, but we are not born with it, what are we.
United we are an army of wet and cold
Never truly together, yet never truly alone
To be is to not to be
And yet I am both what am I
Immortality is always with me and
Nothing last forever...what am I