The following is the list of ingredients as required for the manufacture of methamphetamine: (Give or take, not all ingredients will be needed)

Ephedrine (cold and allergy medicine)
Pseudoephedrine (cold and allergy medicine)
Alcohol (Rubbing/gasoline additive)
Toluene (brake cleaner)
Ether (engine starter)
Sulfuric Acid (drain cleaner)
Methanol (gasoline additive)
Lithium (camera batteries)
Trichloroethane (gun scrubber)
Anhydrous Ammonia (farm fertilizer)
Sodium Hydroxied (lye)
Red Phosphorous (matches)
Iodine (Veterinarian products)
Sodium metal (can be made from lye)
Table/Rock salt
Kerosene
Gasoline
Muriatic Acid
Campfire fuel
Paint thinner
Acetone

If the ephedrine or pseudoephedrine isn't already in pure powder form, then it must be separated from the tablets of cold medicine that contain it. To do this, the cold medicine tablets are mixed with a solvent and the solution is then filtered and exposed to low temperatures to separate and remove the inert material of the tablet.

The pure pseudoephedrine is then mixed with red phosphorus and hydriodic acid.

The red phosphorus is then filtered out (and later reused), and the remaining acid is neutralised by adding a lye solution.

Hydrogen chloride gas is bubbled through the liquid meth, making it a crystalline hydrochloride salt.

This is poured through a filter cloth, and the meth that is left on the filter is then dried.
Once dry, the meth is "stepped on"), weighed and packaged for shipment or sale.

This will generally take place over 2 days.