Water
From PyroGuide
Simple enough, this is H2O. Found in any household, water can be taken straight from the tap for most purposes, including drinking. Just be sure not to drink after mixing with one of our harmful pyrotechnic compounds. Ingesting firework materials is probably best avoided altogether, though absorption through firework smoke sniffing is habitual for many firework lovers.
[edit] Uses
Water, in pyrotechnics, is used to knead stars while binding, to make paste for making tubes and pasting shells, to make slurries of compositions for various purposes(eg. black match), and to make granulated BP.