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Okay so fill up the seven liter jug completely and pour as much as you can into the 4 liter jug. You now have 3 liters in the 7 liter jug and 4 liters in the 4 liter jug. Pour the 4 liter out half way, now you have 2 liters in the 4 liter jug. Now pour the contents of the 4 liter jug into the 7 liter jug that has 3 liters in it. You know have a jug with 5 liters.
1 gallon is roughly equal to 4.5 litres.
Fill the 5L jug. Pour into 3L jug so that it is full and 2L remain in the 5L jug. Empty the 3L jug and then pour 2L from the 5L jug into the 3L jug. Fill the 5L jug again. So now you have 5L in the 5L jug and 2L in the 3L jug. Total of 7L.
It would take 2.52 bottles to fill a gallon jug.
4 / 0.5 = 8 Therefore, you can fill 8 half-litre glasses with a jug with four litres of water.