Unflavored WTA juice typically has a nicotine strength, I believe that Aroma sells it in 24 nic and 36 nic strengths, in either PG or VG. I bought the 24 as it's less expensive and I really was looking for the alkaloids. I don't dilute it down but I was really putting a very tiny amount in my tank (probably less than 5%) so figured it wasn't going to affect my nic level very much. I felt that diluting the juice itself would also be diluting the alkaloids, which was not what I was after. Depending on tank size, I doubt very much if you use it sparingly, that you will notice the slight bump in nicotine.
You certainly could dilute the strength and then add flavors to it, should you wish to, or even use it at a diluted strength, but you'll have to see how the alkaloids affect you (some people, like myself, it helped a great deal, other people didn't find the same outcomes and found it made little change to their vape) so, you'll have to experiment. But, if you buy unflavored "wholesale" from Aroma (kinda a misnomer in a way, since you'll be getting a 10 ml bottle) it will have nic strength listed and you will have various options (Pg/Vg) to try.
Good luck, if you decide to try them. I found them very helpful and still do on occasion during my more stressful days.... Even if I'm not using it, I will always keep at least one bottle on hand, as, you know.... But, for me they were a great transitional device, and really helped manage my w/d symptoms from tobacco.
Anna