Many tradeskilling recipes call for "liquid". For such recipes, liquids from various sources around Norrath would work.
- Purchased (from world wide fuel merchants)
- aerated mineral water for 6c
- distilled water for 18c (removed from vendors)
- Dropped (various corpse loot/merchant foot)
- The most common was 'saliva' vials (of those, the most common was canine, from gnolls)
- Various other items that were "logically" a liquid, such as vials of slime/muck/goo