Why it is worth carrying at least a hundred white healing potions, and four ways to get them: from the Merchant of Mammon, by fishing craft, from raid boss minions and by spoil from ordinary monsters.
The potion of accelerated HP recovery, 
Greater Healing Potion, or simply the white healing potion, restores HP faster than the ordinary potions sold in shops. There are quite many reasons to carry at least a hundred of them. I do not use them all the time, for I grudge them, but from time to time I have to: critical situations happen.
For us, as purely peaceful characters, these bottles matter when we meet a crowd of mobs with no healer nearby, when ordinary bottles and vampiric do not save. That happens now and then. I was doing the second profession quests for a crafter near Giran when a crowd of players 60+ came along: they needed the spot to level their pets. And I was only level 39. There was no reaction at all to my doing a quest, and in the end they dropped a big train of mobs on my head. Luckily I had white potions in reserve: I had to run in circles, heal up and little by little beat the mobs with a pike. I coped.
I also need these potions at the start of a server to knock some item out of mobs that are either higher in level or have a strong magic attack. They are a must, for example, when knocking out the 100% recipe for the Blue Wolf Helmet: all the mobs there are group ones, with a magic attack and with stun. And when farming raid bosses, especially small ones, when there is neither a healer at hand nor help to expect, and the boss may land a crit taking off almost all your HP: that is when the white potions come into play.
Where to get them
- There are several ways of getting Greater Healing Potions; some are simple and some rather exotic. The easiest and simplest way (only adena is needed) is to register at Mammon (so that your side wins 100%, register one twink for the dawn and a second for the dusk), come to the Merchant of Mammon in the victory week and simply buy these potions from him. Both ordinary adena and ancient adena are needed.
- An exotic way of getting the bottles is to craft them. The green recipe,
Recipe: Greater Healing Potion (100%), is sold in clan halls; I think it can even be got from some fish; the craft is common, that is, everybody can craft, not only dwarves. To craft one bottle you need three Fish Oil and three Fish Scale. The exotic part is that you have to fish (Fishing: rules, skills, lures and fishing shots), and we have somewhere else to spend these components. - One more exotic way is drop, and not from ordinary mobs but from raid boss minions. The drop is 100%, but only one potion falls. Not our method.
- And there remain only the ordinary mobs, from which there is not only drop but spoil too; from some mobs up to three potions can be spoiled at a time, and if the server is not x1 but higher, it is a song altogether, and a hundred potions can be spoiled rather quickly. With drop everything is clear, it will fall or it will not, whereas the spoil is decent. True, many mobs are in inconvenient places, but there are options. From the robots in Pavel Ruins 2-3 potions are spoiled at a time, and there is also a convenient place there with Spelunking Ant, which will do too.