My friend thinks that she has mono. She went to the doctor and they said it probably was but they are not sure so she is going back tomorrow. Yesterday night I drank out of her water bottle. She drank out of it and then refilled the whole thing with new water. She hadn't drank out of it for 12 hours. I had 2 sips because I wasn't aware she was sick.
What are the chances of getting mono from that if she does in fact have it?
I thought I had mono last year but it turned out to not be. I am 18 and don't know if I've had it before.

Please help!