What's a good item card to get water energy out of a deck in pokemon?
From your deck, there's nothing I can think of specific to water.  You have Energy Spinner and similar cards that get any energy, though, but not enough to make that card all that powerful.

Blastoise though, if you're going to play him, you might as well play Team Up Blastoise:


  Once during your turn (before your attack), you may look at the top 6 cards of your deck and attach any number of Water Energy cards you find there to your Pokémon in any way you like. Shuffle the other cards back into your deck.


That's realistically a better version of the above card, and is standard-legal.