Check this DIY water injection

http://www.turbomirage.com/water.html

There aren't as many gains to be made on a NA car as a SC or Turbo. And the benefits are really for the heavily modded car to begin with.

I built my own, and later found this site:
http://waterinjection.info/phpBB2/

Try them out. They have a special forum just for NA cars. WARNING.....water injection can be very dangerous. You'll see why on that forum. (You'll also see me pop in from time to time)

too much and you can hydrolock the engine right?

the forum requires you to amke a login to see posts.

Thats right! I know that one for sure because we did that to my dads Jeep CJ-7 before. Took it out 4-wheelin and ran through too many puddles, deep puddles that is! Of course getting it submerged didnt help either.

intake failure is another great way to hydrolock your car