draw a diagram of the water molecule. then draw where the electrons are to show it's covalent.

so does that mean its lewis structure, which would be:

..
H- O -H
..

but where would the electrons go?

Many pictures of H2O here:
http://images.google.com/images?hl=en&q=%22water+molecule%22&gbv=2

but which one shows the electons

http://www.promotega.org/UGA06004/covalent_bonds.html