6 month old first word?

my baby was playing with my bottle of water, whilst i watched her. she was trying to unscrew the bottle then putting it too her mouth. she then clearly said drink. is this even possible at or am i hearing things. i see a lot on internet but the babies are all saying things like mama or dada, not drink. she doesnt even babble as in dadadada, or mamamama, but her sounds are like iya, ello, ok, yeh, which makes it terribly difficult to tell if they are first words and it sometimes sounds like she is answering our questions, but then other times its as if she doesnt understand anything, its very hit and miss.