The luscious water apple is scientifically known as Syzygium aqueum and belongs to the botanical family Myrtaceae. The water apple plant is native to Indonesia and Malaysia and grows in all tropical regions of Africa and Southern Asia, including India and Thailand. Water apples are considered fruit crops.How to Use Water Apple? Water apple is majorly used in the form of raw fruit. It may be used to form juice and jellies. It may be frequently used in fruit salads. It may also be used in making jams, pickles, sweet beverages and squash.