I would discourage you from using a windshield washer pump. You'll likely run into a lot of hassle hooking it up to run off of household current (110v) as it is probably wired to run off of 12v DC. Instead there are a couple other choices. The other poster mentioned the misting system designed by BARRS (www.barrs.com). You can buy a kit with nozzles and hose from them for about $15.00. You purchase a battery operated digital sprinkler timer and use it to control your misting cycles. There diagrams are pretty easy to follow. Your second choice is to use an electric piston pump hooked up to a digital household timer. You can purchase a 55 psi pump from Able Supply (www.ablesupply.com). The actual pump you want is the AP30 made by Flojet
(http://www.ablesupply.com/common/order_browse.html?search_type=websearch&web_class_opt=zzz&search_val=flojet pump&item_find_start=5).
It sells for $39.95. You can get the timer from a Home Depot or Lowe's for $29.00, 5 gallon bucket with lid for about $5.00, misc. fittings, teflon tape, etc. about another $5.00. Add on your misting system parts from BARRS and you've got a rather nice system for less than $100.
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Matt Campbell
Animal Keeper
Small Mammal/Reptile House
Lincoln Park Zoo
Chicago, IL
Assistant Curator
Wildlife Discovery Center at
Elawa Farm
Lake Forest, IL