IMPORTANT: This document might be wrong in some aspects - perhaps
from the outset of it ;-)

This is the current ruling for drinks and food:

- Alco-drinks  : Using "/obj/drink" or drink_alco()
                  min cost     = strength*strength-strength(+10 for the bottle)
                  max heal     = (2*strength)-2
                  max strength = 12
- Sober drinks : See alco drinks, but negative strength
                  min cost     = strength*strength*2
                  heal         = 0
                  max strength = -6
- Soft drinks  : Using heal_self()
                  min cost     = heal*heal-heal*5
                  max heal     = 200
                  strength     = 0
- Food         : Using "/obj/food" or eat_food()
                  min cost     = strength*6
                  max heal     = strength/2
                  max strength = 20
- Potions      : See soft drinks

All wizards who have already opened a bar or tavern of something like that
should correct their prices according to the rules above.
The bars, that aren't corrected will be closed.
Exeptions will be given only by an archwizard.

It will be a good idea to use the generic pub /obj/pub.c to build a new pub.
Look at the code of /room/pub1.c as an example for such a pub.