If you don't have a block heater, you can always try using the alternative, which is the oil pans heaters. An oil pan heater can be attached to the engine's oil pan using magnets. However, since they are attached via magnet, they can easily fall right off when you hit a bump in the road. Another option is getting the lower radiator hose heater units. Radiator hose heaters work by beginning the warming-up process in the coolant of the heater hose. Most of them will have a higher wattage, making them easier to use and quickly warm up the engine.