Things you need:
completed the quest
As a First Resort
Level 81 Mining (to mine red sandstone)
Level 89 Crafting (to craft flasks from sandstone)
Should you wish to create the vials yourself, you’ll need a brand new resource called red sandstone. With a Mining level of 81, you can mine the non-tradable red sandstone north of Oo’glog (south of the Feldip Hills). You can mine a maximum of 50 red sandstone per day.
Take the sandstone to Oo’glog (after completing the As a First Resort quest), to Rutmir’s robust glassmaking machine. You can use the machine to fire the red sandstone into robust glass, which can be blown into potion flasks using a glassblowing pipe, as long as you have a Crafting level of 89. Decant potions into the flasks and feel thoroughly prepared for long combat trips (flasks will shatter once emptied of their contents).
Completed flasks are tradable. We expect entrepreneurs with the Crafting and Mining levels to make a healthy profit, should they choose to sell them on.
most copyied from http://www.runescape.com's fourm
Edit #1:added other post Feb 19/12 12:07 AM
Edit#2 added external link!! feb 19/12 12:54 AM
Edited by JonHoward, 19 February 2012 - 06:55 AM.