You don't need a drip tip to drip.  Most atomizers come with a mouthpiece -- it's just a cartridge without any wadding inside it.  Remove mouthpiece, drip 3 drops into atomizer, replace mouthpiece, 
vape.  Pretty easy.  If you don't have a mouthpiece, use tweezers to remove the wadding from a cartridge and use that.
I don't really like dripping because I find the atomizer leaks too much onto the battery and I'm forever cleaning off the battery and atomizer threads.  I only drip when testing new flavors or maybe 
vaping something exotic.  For everything else, I use cartomizers.