There are many answers to your question, and they mainly depend upon a number of variables;
1. How much fuel are you hauling?
2. How far are you hauling it?
3. What is the lift capacity of your machine?
4. What is the fuel consumption of your machine?
5. Is this a regular event?
6. Is it a fuel cache?
7. Do you have pumps, power, facilities, people where you are fueling?
I ask this because in the range of solutions are blivets, barrels, fly-away tanks, fixed wing tankers (C-46, DC-4, C130, AT-802, etc), fixed wing freight hauler (C-206 and up} or anything else. I'm sure your solution may be more easily solvable, but there are a huge range of options out there.