Water system tips: Check to see if tanks and pipes are insulated and if heat can circulate around them. Keep your fresh water tank full. If the hose connected to the hydrant is not insulated and there is a freeze turn off the hydrant, disconnect and drain the hose so it does not freeze. Inside your rig you may have to leave cabinets/access doors open and even use small electric heaters if it is extremely cold. Empty any external showerheads or faucets. Empty your tanks periodically instead of letting them drain continuously.