I got the new Summit Racing catalog and they now carry a Pivot water sprayer controller and nozzle kit...
go to www.summitracing.com
the part #'s are:

JDM-PIVWSC - thats the controller which is only $150
JDM-PIVWSN-1 - thats the nozzle kit

just thought i would share to you guys who are always asking about the water sprayer ideas!