In Brazil

It is raining A LOT here now!!! (or you can say it is "raining cats and dogs" to mean a lot of rain) ( I would also emphasize the A LOT rather than the now)

But we need it very much because the water supply is low.

In Brazil, our water reserve is running out (or running very low) and the population should conserve it more.

In Brazil

It is raining a lot here nowwwwwwwwww !!!
But we need very much, because the water is little. :-)
In Brazil, our reserve of water is running out, and the population should save more.

In Brazil

It is raining a lot here nowwwwwwwwww !!!
But we need it very much, because the water is little supply is low. :-)
In Brazil, our reserve of water is running out, and the population should save more.