Antifreeze will lower the freezing point of a liquid.
Antifreeze is put in a car's radiator to act as a coolant.
Antifreeze has a sweet smell and is toxic if swallowed.
Propylene glycol is used as an antifreeze in cars and trucks.
If it isn't, remove the inlet hose from the pump and attach a piece of spare hose from the inlet valve and into the antifreeze bottle.