lets see, a knife, a grinder, a leather pouch, and a small cylinder thing that glows.. oh and a spoon.
unless we make an enema joke, i'd say you take the lyrium out of the cylinder, cut a small part of it with the knife, use the spoon to put the lyrium in the grinder, connect the pouch and start grinding. you then keep your lyrium dust in your pouch. at later times you just put some dust from your pouch in the spoon and use it like sugar for your tea.
btw does it even make a difference if you encourage him to keep not using it or not? do you have an option to replace him?