These are some of the benefits of drinking
water. We can be healthy by drinking water
everyday. Water can help our body to work well. Our face and body will become youthful. Drinking
water can make our body slim. That's why we
need to drink lots of water everyday.

Hi Kate! always remember to capitalize the first letter of a sentence like this:

We
Water
Our
Drinking

Writing a paragraph should have the main
idea or the topic of the paragraph "These are some of the benefits of drinking water". And always end it
with your own conclusion " That's why we need to drink lots of water everyday".

I want to compliment you because you had so many
great ideas in your mind express it very well through 
complete sentences.