Toast-and-water. (Clement’s.)
Toast slowly a rather thick crust of bread till extremely hard and brown, but not the least black. Plunge it into a jug of cold water, and let it stand, cold and covered close, for 3 or 4 hours; strain it through a wine strainer into water bottles for use. Make it fresh daily.
Another toast-and-water entry says:
“Toasted oatcake, with boiling water poured over, makes quite the best flavoured toast-and-water.”