Anhydrous

[Britney]

A substance that contains no water, or very, very little water/humidity, from etymology an- (no) [hydro] (water). A good synonym or similar word would be [hydrophobic], from etymology hydro- (water) [phobos] (fear). However, it does not necessarily mean that this substance may not have the appearance of a liquid.

[PussyCat]

(of a substance, especially a crystalline compound) containing no water.

[Zipporah Schumaker]

[Anhydrous] [based] [methamphetamine]