If your oil hasn't turned black, you can wait for it to cool down, then put it back in the bottle for repeated use. Otherwise, don't pour your frying oil down the drain, as you risk clogging it. The best thing to do is to put it back in the bottle once it's cooled down (very important, otherwise it'll have holes in it), then take it to a waste disposal site with hazardous waste or special household waste. And if that's impossible, at least put it in the non-recyclable waste garbage can.