the river near them they did not care that it was not fresh
Rain.
Boiling it then storing it in animal skin containers.....
They need: extra clothes Fresh water Food Things to trade Weapons
I can only guess what the Vikings had in their survival kit. Besides food and water, they would have their battle axe and spears and their armor. AT sea they would have the sun stone for navigation.
The water.
water
the Great Lakes are fresh water.( the largest fresh water lakes in the world.)
fresh water
Fresh water.
spring water is fresh water
Fresh water