Yeast

Dry and liquid yeast for beer, cider, wine and ginger beer — Lallemand, Fermentis, Mangrove Jack's, Morgans and Bluestone's liquid strains — kept in the fridge here and checked for date before it goes out.

Yeast shapes flavour more than most brewers expect. Split one batch of wort between a clean American ale strain and a Belgian one and you'll get two noticeably different beers from otherwise identical ingredients. Buy it fresh, pitch enough of it, and hold your fermentation temperature steady. Fermenting a sugar wash instead? That's spirit yeast.