To decant the potion into the flask, one must have at least 6 doses of super adrenaline potion in their inventory, as well as one or more potion flasks. Using the flask on the potion will open a menu to decant them. Alternatively, Teplin Macagan or Rhodri Dail will decant the potions into flasks for you (including noted).
Once the potion has been partially drunk, no more doses can be added to it. After all six doses have been consumed, the flask will shatter and disappear. Flasks can be combined together, but the empty flasks will still be destroyed afterwards.