You should be able to #tip potions onto your own square or onto an adjacent square. When tipped, it causes vapor effects to all monsters in the 3x3 area around that square, including yourself, and also causes “potion on skin” effects to the monster it was tipped onto. Some potions may not have such an effect beyond their vapors, but ones like polymorph, acid, and healing ought to.

Among other things, this provides a way to administer polymorph or healing potions to a pet without attacking it with a wielded potion.