If the barrel is open top, a small submersible sump pump works well. If you have bung holes, there are numerous drum pumps available in a wide range of prices. I like David's method best. Either put a bulkhead fitting and valve in the bottom of the barrel, or screw a valve into the one of the bung holes and lay the barrel on it's side to pour out of.
I have an old water bed pump (I haven't had a waterbed for years, but still have the pump) that I've tried pumping 2:1 with. It works, but it struggles and the motor gets hot. If you were pumping only a few gallons at a time one would work very well.
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