I typically blow out the water lines with air from the city water connection on the street side with one of these:
Blow-out Plug - Item - Camping World
I typically use about 30 to 45 psi and go faucet to faucet, then the low drain valves.
Later, after the water is mostly out, I follow up with standard RV antifreeze. Under the curb side closet, there are two square pieces of wood. One has a CO detector in the middle and the other has a heat vent opening. These squares are actually doors and give you access to the pump. I bought a fitting from the local hardware store and attached a hose to it. From there, I disconnect the pump intake line, connect the fitting with hose I got from the local hardware store, and place the hose into a gallon jug of RV antifreeze. Bleed the hose, then open faucets one at a time (including the water heater, toilet and shower). After all faucets have had the antifreeze put through them, I pour a bit down each drain trap. Reconnect the water pump, and yer done.
A few side notes, I drain the low point valves during blowout and cycling antifreeze. These are located between the curb side wheels. Also if your Safari came with a kitchen sink water filter, remove it before putting antifreeze through it or it will be shot.
I realize some is a bit overkill, but IMHO an ounce of prevention is worth more than a pound of cure. Replacing busted out lines (supply or waste) is a major PITA. My unit, though never really getting very cold in indoor storage could be fine up to 50 below based on the antifreeze not being diluted with any water. Some folks only blow out the lines, some only put antifreeze in..me I do both. Cheap and doesn't take more than an hour or so.