I'm not sure if dispersion is appropriate here - except for adding unnecessary render time. I haven't seen a product photo yet of a bottle with water drops where the drops showed a dispersion effect. It would be pretty distracting and people would want to avoid it.
Totally not a solution in your case, and I'm sorry if this adds to your frustration but wanted to point out there is a really good tutorial on Digital Tutors about using RealFlow to create exactly what you are looking for, even animated drops that stick together and fall off a can....just thought it's worth mentioning in this thread
http://www.digitaltutors.com/tutorial/1 ... n-RealFlow