As far as I know, the flasks you find in Serpent Temple are the only ones.
If you sold them to a shop in town, you can buy them back.
If you have no saved games with flasks, send a zipped savegame file to
me as an attachment and I'll see if I can give you a flask. No promises tho!
You cannot advance very far in the game without finishing the temple.
r.robinsonNOSPAM@MAPSONgns.cri.nz - remove the capital letters.