Question

how many atom molecules are there in a water molecule?

Answer 1

Now atoms are one thing and molecules are atoms bonded to each other.
I think you intended to say:

"How many atoms are there in a water molecule?"

If that is the question, the answer is THREE,
2 hydrogen atoms and one Oxygen atom.
H2O

Answer 2

Thank you so much. Thanks for understanding the question even though I made no sense.