Ewer
Ewer
A large jug for holding water or any liquid is a Pitcher. Or a Ewer, which is a large jug holding water for washing
Ewer.
A water jug is usually "ewer." I realize that's only four letters. Perhaps it was plural.
ewer
Ear.
Jug, carafe, decanter
A four-letter word for "jug" starting with "e" is usually "ewer."
Fill the 3 liter jug with water, then pour it into the 8 liter jug. Refill the 3 liter jug and pour water into the 8 liter jug until it is full, leaving 1 liter in the 3 liter jug. Now, empty the 8 liter jug and pour the remaining 1 liter from the 3 liter jug into the 8 liter jug. Finally, refill the 3 liter jug and pour it into the 8 liter jug, filling it up to 4 liters.
pitcher
jug, pitcher, amphora