I decided to put up this instructable because (to my surprise) no one has a hydrophone instructable up yet. I made mine using a mixture of other people's hydrophone creations that I found through a google search and a bit of ingenuity.
Here's the parts that I used but it should be fairly easy to adapt whatever similar items that you can find.
knife or scissors
( I used a small spray bottle that was originally some "energy-caffeine spray")
Step 1: Breaking Down Parts
You also should have your bottle or container taken apart.
Step 2: Cut, Strip and Connect
After the cord was in I stripped the wires and connected them to the Mic Capsule by carefully twisting the wires together.
Step 3: First Test
Plug the mic into your computer or recording device and test it.
Step 4: Soldering and Wrapping Connections
If it was not make sure that your wires are in the right spot and that they are well connected also check the volumes of your recording equiptment.
There are a lot of different ways that you can do this, but you need to insulate the wires so that they do not touch each other, the mic capsule, or water.
If I had access to a glue gun I would of sealed them that way instead I used plastic wrap, and indiviually wrapped the connections and then wrapped them all together.
After you do this its a good idea to test the mic one more time.
Step 5: Fitting the Capsule
Step 6: Vegitable Oil
Push the lid over the bottle opening, the mic will dip into the vegetable oil and go into the bottle,
The lid should stretch and go over the bottle and create a near air-tight seal, some vegetable oil will probably come out be sure to wipe off the oil before putting it in water, you do not want any air in the bottle it should be full of oil.
I taped around the edge, where the lid was over the bottle and wrapped more plastic wrap around it to make sure it was sealed well.
It is also a good idea to seal the lid where the cord is at with hot glue or super glue.
Step 7: Done
A key ring with some old keys works great.