Water Pump

I make my own RO water and collect it into 25 litre barrels. I used to be able to pick them up to pour into a bucket to pump into the tank, however I hurt my back and now I struggle to pour them in. I am looking for suggestions for a pump that will fit over or into the hole of the 25l barrel to pump it into the tank or bucket. I thought about a borehole pump but they seem a tad expensive and a bit too big, does anyone else have any suggestions?

 

Small DC pump that you buy at camping places wit a 12v 2 Amp psu or a gate motor battery. They fit perfectly in the hole of the drum.

 

Thanks Barry was wondering about that too.... managed to find one at not too a hectic price too

 

I am assuming that the same can be used to drain water from a fish tank?