Cool. I have some thin tipped bottles that I use to fill. But if not, I'd use the soft caps.
I got the VG base from vaperenu it's not super thick but then I mix it with straight VG that is really really thick to get down to about 12mg from 36mg. I've been kind of switching to buying there flavors too. They come in a 1 once bottle with a nice tip on em that just works so well with the mixing in the tank. That and I LOVE they're pink lemon aid flavor! Among some others. But anyways, I've never added any water to the mix.
OH! and I really wish joyetech would make a VV eGo already!!!!! I only use the eGo-c since I got it. Don't drip don't use my old carts, nothing else. I just like the ease of the tanks even if it diminishes the flavor a tad. I just add a tad more flavor.
Does the VV really help that much for you? Adding more flavor seems to work out for me except on some chocolate flavors. They just don't seem to do as well. I keep messing with them though trying to find a fix.
I'd be wary of using deionized water. I used to run the DI H2O systems at a research lab complex. Only polymer lines and valves are used. DI H2O, being stripped of metal ions through ion exchange resin and polished with reverse osmosis, will scavenge metal ions from any metal it is in contact with, even stainless steel.
I'd suggest only using distilled water or water purified by reverse osmosis.
@O-Man and Kent C:
do you use with your type B body same heads you did with type A?