I don't know what game you are talking about but if you mean Ocarina of Time you need zora tunic and the iron boots to walk into the temple and not drown. Then use the hookshot to pull the switch at the top and open the door. If you mean Twilight Princess you need the zora armor to dive to the to the bottom of lake hylia where the temple is. Put on the iron boots and use a water bomb to break rocks on a jet. Then put another bomb ao the jet to break the rock in the way to get in the temple. With the rock destroyed you can get in.
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You need to get the Longshot, the main treasure in the Water Temple in Lake Hylia
you go to the little island in lake hylia AFTER you beat the water temple and you get your bow out and shoot the sun. easy right :P
Do the Zora diving game. Win it. The you will get the Silver Scale that allows you to dive deeper. It allows you to dive for 6 seconds. That will allow you enough time to dove to the bottom of Lake Hylia to get the bottle.
you throw rupees into the wishing well in the middle of lake hylia
after the temple OF ice you use the iron boots in lake hylea and you will see a door, go into it and it will be the door to the temple ( not the one to zora domain)