How do you drain the fresh water tank?

[weekenderdude]

I never used the fresh water tank in our rig. We also use the city water. I was told that we should sanitize the tank a couple time a year.

1. How do you drain the tank?
2. Where is it?
3. What should be use to sanitize?

2004 36CK3

Thanks for any help or advise.

-Todd