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I don't mop or spray, but I use lemon/OJ/Oyster sauce for a braze in the foil. Pineapple juice is great for that too. Really, any fruit juice you have on hand will add to the moisture and flavor, and for a spray-on, the natural juice sugars will aid in bark formation. Whatever you have should do fine, brother.
What are you cooking ? Any broth would work as well...but what ever the meat is would depend on what route I would take....edit I see this is in the PORK section so I would think it's pork...lol...any juice like said before...heck pretty much any liquid would do with pork in general. I don't spritz much so no need to worry if you don't have anything mine come out great