Originally Posted by Topgoon
Originally Posted by Madscientist
You can get resistence against X from potions and you find a lot of those in the game and they last until you rest.

Based on this post, there appears to be 8 in the game. In my current Patch 4 "100%" save I have 6. I likely missed a couple, or there may be a degree to RNG when it comes to loot. Regardless, it's a decent amount if you're only using it for 1 character, but 8 potions will only last the party for 2 rests.

Note, you also cannot stack the resistance potions (but it does work with the spell). So in the EA right now, you can cast the level 2 Protection from Poison spell and drink any other Elemental potion to have 2 resistances.
I may be wrong but I'm pretty sure vendor potions restock after every long rest. I haven't counted who has what at any stage but that basically allows a steady supply if the vendor has the common potions.