I have to agree with High Cheese. Anything you put in the grill is going to heat up
enough to ignite the grease/oil when it drips. If it doesn't, then you might not be
getting the heat you want/need to grill properly.
Get inventive with your squirt bottle, and add a bit of smoke flavoring, or apple juice
or other aromatics. Then, when you put out the flare ups, you are adding a little hint
of flavor! (And if not, it still adds to your Grill Master mystique, LOLOL!)