DIY is , in my opinion the way to go . You can custom tailor your juices to any taste or nic. strength you want . BUT do not use water , except distilled water ( few drops ) to dilute a 100% VG juice that's to thick to wick in a tank or carto . And for sure do not try to use regular juices and extracts to flavor your juice . As said earlier in the posts , there are several vendors that sell flavorings for the juice , and they're cheap . So by all means , buy some VG. and PG (EBAY) and do your thing . JUst be sure to use only USP labeled VG's and PG's to make your juice .