Most mixing calculators have an area for water/pga so it will calculate the water into the final mix. I will post my daily vape so you can see how it works out.
Menthol Mint
I use 3% water in my 60/40 mix. I also use a pipette to measure the vg so I can use it think and uncut. As you use it more and more you will get to where you find the right ratio for your setup.
Also I might add if you are a dripper you can keep it think. If you use a carto and you get burnt hits then thin it out. If it leaks out then thicken it up. Also keep in mind summer is coming and what works in the winter for thickness will be different in summer.