I don t know the meaning of the different colored jerry cans
I saw on OIF pictures red jerry cans attached to the tank
other colors of jerry cans were light yellow, and olivedrab
The Jerry cans with the fuel what colors are they?
The Jerry cans colored in red what do they contain?
The jerry cans in yellow are they containig water?

Euro,
US fuel cans can come in normally in either Tan plastic, the new ones, or OD Green metal, the older ones. Water cans are normally tan plastic with a larger filler cap than the fuel cans. They also have the word "water" embossed in them as the fuel cans are a bit wider and have "fuel" on them. The fuel cans are normally marked as such: Yellow topped cans means either diesel or JP-8 fuel while the red means gasoline, benzine or MOGAS.

John