Water? Really? I only use plain or plain/nic P.G. then add Loranns. To add vapor or stretch the juice you can add some Gylcerin from the drugstore (USP on the label) It's the same thing as V.G. but a bit thicker Do not dilute P.G. with water..it makes for watery juice that will leak out or kill a battery.
With just glycerin or V.G. you can use water to dilute..but just a tiny bit! If you make a flavor too strong..just add yout P.G. or V.G. untill it's a lighter taste!
When I did diy I used a tiny bottle I got at the drug store, it's a breath drop found at checkout or near the tooth brushes. That way I could try a couple of mg at a time.