I will cite a few examples:

That is, if you trying to lose or add weight, it can help in achieving that.

This sentence should read: "That is, if you are trying to lose or add weight, it can help in achieving that."

The developers of aqua droid came up with a scintillating idea to enable us drink the adequate amount of water needed for a healthy life

This one should read: "The developers of aqua droid came up with a scintillating idea to enable us to drink the minimum amount of water needed for a healthy life", or even "The developers of aqua droid came up with a scintillating idea to enable us to drink an adequate amount of water."

the app achieves its main aim of ensuring one gets to be more aware of his/her water intake.

This one should read: "the app achieves its main aim of ensuring one gets to be more aware of their water intake."

Now, regarding your remarks:

Although, your comments contrast greatly with the review score given

I went over everything once again and I still think I scored it correctly. Could you please explain?