Answer:

Each person gets 7 jars and 3.5 jars of water

1 st person - 3 full-filled , 1 half-filled , 3 empty jars

2 nd person - 3 full-filled , 1 half-filled , 3 empty jars

3 rd person - 1 full-filled , 5 half-filled , 1 empty jars

so, each person gets 7 jars and 3.5 jars of water (equal amount of water).