if so what does it do? and what pets turn out cute?

If you get it in the Ornate Floral Pitcher it makes a glade potion and you can see them here

The water at Peka Glade can be used to turn your pet into a glade pet if you have the in your inventory. The pitcher restocks at the Token Shop and at Seedlings. You can fill your pitcher between 8am - 9am and 8pm - 9pm Subeta time. If you click here you can find some more examples of glade pets.

If you fill an with the water (during the winter, I believe) and feed it to your pet, it will turn them into a:

thank you, but i also have another question if you used an elixir on a kora pet to make it a feli and then you used a the peka glade water on it to make it glade will it turn out as a glade kora?

Actually, if you fill any container with the water other than the ornate floral pitcher, the pet will become a camel. Not just the empty vial. :) Don't think season has anything to do with it either.

The Glade Potion will turn it into a Glade [current species], so don't worry about your pet formerly being a Kora. If your pet's a Feli when you use the potion, it should become a Glade Feli. :)

ok thank you!

Is there a way to change your pet back to normal if you accidentally turned it into a camel? :s

Any elixir will change your pet back :) If it was a Feli before, use a Feli Elixir. If it was a Kumos, use a Kumos Elixir... etc.