New Owner Questions

Hello: I have purchased a 2007 2619 and have a few TM questions.

First, where is the electric water heater switch? Supposedly there is a switch behind the outside heater access panel. I am to remove a a cotter pin and press on. For the life of me I can not find that switch or cotter pin. Where is it?

Second, what is an appropriate sized grey water tote? I have read that a 10-12 gallon tote is sufficient in that the toilet only holds eight gallons. Any tote brand name suggestions?

Third. Somewhere on this site someone suggested replacing the white buld in the patio light with an amber one. My local RV dealer said no such amber bulb or amber lense exists that would fit in my 2619. True? If not could someone identify a bulf or lense that I could order? Thanks, Don