The Siphon Pump
Designed for 55 Gallon drums, however can easily be shortened with a saw or sharp knife to fit 30 or 15 gallon drums.
It's so easy a five year old can use it.
It can be screwed in to the narrow thread bung opening most barrels have, for one handed use, but can also be used with any opening 2" or more in Diameter.
Comes with a flexible hose to direct the water where you want it.
Buy 2 you'll need them!