Supplies for an administrative office would be classified office supplies, which is always treated as a cost of a period. Supplies for a manufacturing company would be classified as a product cost, i.e. wood (supply) in order to make desks (end product).
Environmentally friendly supplies will cost a bit more than wholesale, regular janitorial supplies. This is because of the increase in cost to make it greener as well as the perceived "value" of using a green product.
1918 saw the average raise rise to $875 per year. The average house cost $6,715 and the average car cost $360. Although it is difficult to find the price of a pint of milk, a gallon of milk cost around 55 cents in 1918.
industry and the navy. the navy helped to keep the south from getting the supplies they needed by setting up a blockade and the norths advanced industry helped to get guns and ammo as well as supplies to the northern troops