A character can throw a flask of 
acid as a grenadelike 
weapon. A flask is made of ceramic, metal, or glass (depending on the substance it has to hold), with a tight stopper, and holds about 1 pint of liquid. This entry represents any mild caustic substance. 
Acid may be purchased in many places, including hardware stores.
A 
Molotov cocktail is a flask containing a flammable liquid, plugged with a rag. A 
Molotov cocktail is easily made by hand (Craft [chemical] check DC 10 or Intelligence check DC 15). The purchase DC given is for the components. To use it, the rag must first be lit, requiring a 
move action (and a lighter or other source of flame). The cocktail detonates in 2 rounds or on impact with a solid object, whichever comes first. A target that takes a direct hit is dealt an additional 1d6 points of fire 
damage in the following round and risks 
catching on fire.