Water has a very high heat capacity: higher than antifreeze (it absorbs more heat with the same rise in temperature) and is therefore one of the best coolants. If you have no sink, circulate water through your condenser and back to a bucket of water with a cheap aquarium or fountain pump - the flow rate doesn't need to be high. Add ice to the bucket to absorb heat and keep the condenser working at maximum efficiency. Remember to set up cooling so that cold water enters the condenser furthest from the flask and exits nearest the flask.
Antifreeze is not a good idea: it reduces the cooling effect and increases the viscosity, making the coolant circulate more slowly.