# Potion strategy
Which potions are valuable and which are not depends very greatly on your place within the game.  When you first enter the dungeons, most potions provide some substantially useful effect.  As you gain intrinsics or abilities, most become redundant or only marginally useful.
Recommended potions, in approximate order of desirability:

Table of potions
Always useful

Potion
Notes

full healing
When blessed, heals up to 400 HP and/or raises your max HP by 8; also cures sickness.  Ascending with 6 or so provides a safe number of emergency outs, but save these for when you need them.

gain level
When cursed, teleports you up one level. Useful for Moloch's Sanctum, Gehennom and emergency escapes. Can also substitute for potions of gain energy in alchemy. In case you need the last few experience levels to enter the quest, quaff non-cursed.

holy water
Increments BUC status of #dipped objects.  This provides the most reliable way to bless an object or uncurse items that get cursed during the ascension run.

smoky (can be any type)
Save, bless and quaff for the chance of a wish.  A unicorn horn may be necessary to deal with ill effects.

Usually useful

Potion
Notes

extra healing
Mid-game emergency heal, otherwise save and alchemize to full healing. If potions of gain energy are scarce, you can quaff them for +5 max HP instead of alchemizing.

healing
Early-game emergency heal, otherwise save and alchemize to extra healing.

speed
Without speed boots, useful for difficult combat.  Otherwise, alchemize with healing potions to make extra healing.

gain energy
Alchemize with extra healing potions to make full healing, or with full healing to make gain ability.  Extras can be quaffed for a slight maximum energy gain.

gain ability
Bless to raise all attributes by one point when quaffed.

enlightenment
Alchemize with levitation to make gain level. Alternatively, bless and quaff to raise intelligence and wisdom by one point. Also useful to identify rings and amulets.

water
Bless or curse a stack to make (more) holy or unholy water, e.g. by dipping into your last one.

booze/confusion
Useful for confusing yourself, then reading a scroll of gold detection to locate portals on the four Elemental Planes. A forgotten spell is better; more than two, or an alternate source of confusion render these unnecessary.

paralysis
Throw or wield against powerful (sleep-resistant) enemies, then kill them before they recover.

Sometimes Useful

Potion
Notes

see invisible
If you do not already have the see invisible intrinsic, or in an emergency if blind.

invisibility
If you do not already have the invisibility intrinsic.  Quaff one before eating a stalker to receive permanent invisibility and see invisible intrinsics.

unholy water
Decrements BUC status of a #dipped item.  Useful for cursing scrolls of genocide, teleport, and destroy armor, and potions of gain level.

sickness
#dipped weapons will become poisoned.  Lawful characters are penalized for striking with a poisoned weapon.  Very useful with stacks of arrows and darts.

restore ability
Superseded by a unicorn horn, but guaranteed to work.

monster detection
Mostly superseded by telepathy.  Useful for finding where that nymph teleported to. If blessed, lasts several turns and detects mindless monsters as well.

object detection
Locate the Castle wand of wishing. Useful when searching for Fort Ludios. For zen players, make stash seen.

levitation
Alchemize with enlightenment for gain level. A single blessed potion is enough for the endgame run. Can be used to cross Medusa's level if found in sufficient quantities.

polymorph
Can polypile a single of item.

oil
Recharges oil lamps, repairs weapon damage, untraps squeaky boards for pacifist experience. Throw lit oil for a Molotov cocktail.

Rarely Useful

Potion
Notes

fruit juice
Can be quaffed for a small amount of nutrition.

hallucination
Dip with a unicorn horn to make water. If you lack magic resistance (perhaps because of conducts), hallucination will protect against touch of death.

blindness
Dip with a unicorn horn to make water. Throw at monsters to give them a small to-hit penalty and negate some gaze effects. Quaff it yourself if you need to avoid a gaze and don't have a blindfold handy.

acid
Vegetarians can use these to cure stoning. Dissolves iron bars in UnNetHack.

Finally, any potion (except acid) can be diluted and blessed to make holy water. Water can be mass-alchemized step by step into sickness, juice, booze, confusion, enlightenment, gain level, and these further into healing, extra healing, full healing, gain ability, see invisible, hallucination. You will rarely alchemize the entire chain, but these potions are always available in case you need any.

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