I like to use a spray bottle and load that up with apple juice, or a concentrated apple juice if doing ribs. You can even play around with that and use apple juice and Capt. Morgan or apple juice and a touch or worchestershire, etc., etc. You get the point.
I like to use this spray bottle...got it at home depot for six bucks. Pump it up and pull the trigger. Just don't use something that has pulp, as it will clog the inlet tube screen.