Most of them come with a bypass valves, or valves. Don't for get to pull the plug on the outside bottom of the water heater and drain it also.
If you search on here for winterize, water heater valve, etc., you will find this gets asked a lot, and is covered well in other post, complete with diagrams.
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LadyWindrider
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT
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