Stock up. Keep the heater going until you have your beer somewhere safe.Buy it in cans. Glass breaks. Cans aren't foolproof, but are more forgiving. If it freezes, make sure it is thoroughly thawed before opening.
Make sure your booze (distilled spirits) has reached nearly room temperature (32 or above).
Grain alcohol can get down to colder than -50 and remain liquid.
I drank Jack Daniels' once with slush in the bottle, and it hurt (-35 outside when the bottle was brought in).
Not a good idea, propane just boils off from liquid at those temperatures.