okay here goes!!
i got a washer pump from O'reilly (one that sprays the windsheild) part number 61-12 for $16.29 then I got 2 sprits bottles at target for a buck each.
take the sprits bottle and cut away at the plastic untill you have the nosel with a good amount of stem on it.
http://www.speedphreak.com/gallery/album94/100_9586
http://www.speedphreak.com/gallery/album94/100_9588 and
http://www.speedphreak.com/gallery/album94/100_9591
(sorry for the links... but I couldnt figure out how to add pics

)
then take some line (i used vacuume line from O'reilly) and run one line from ether nosel to a T fitting (also purchased at the O)
then run a third line to the pump outlet.
get a container to hold water and run a line from the pump inlet to the water.
now you will have to get a 120 AC to 12 volt DC adaptor (i had one laying around) splice the end and put some spade conectors on... to match the pump contact size
http://www.speedphreak.com/gallery/album94/100_9592
make sure that the polarity is correct (the black with white stripe is +)
if you plan to run it off a timer..... ur done!
if you want to run it manuel then you will need to get an inline switch (one buck at any craft store) the type with the tumb wheel...
http://www.speedphreak.com/gallery/album94/100_9594
there you go... just adjust the nosels to the amount of water you want and you have just saved a ton of money....
i have had my systm on a timer for about a year.... sprays 3 times a day for 1 min. at a time and I have had no problems!
any questions..... i will try to be as descript as posslble
ps if you cant tell I cant spell worth a ****.... (but im a **** of a nice guy... i think that makes up for it!! hahaha)