We have always carried at least two jerry cans when away from the states. We have the typical blue Igloo cans, though ours are 6 gallon.
I have found that the one extra gallon (and roughly seven more pounds) seem to be the proverbial straw that breaks my back if needing to carry them any distance. My solution is to fill them with only five gallons with the added benefit that now they will float in the water! Now they are considered part of the abandon ship items.
For easy water
transport we also have two small 1-1/2 gallon Sceptre jugs. My wife can easily handle these where the larger ones would be a challenge. Especially when recovering them from the dink up to the boat deck
I give these jugs a good cleaning
with bleach prior to filling. The small amount of residual bleach has kept US water
drinkable for nine months- the longest I have ever let them go.