There is hereby established a special fund within the State Treasury to be known as the “Water Supply Assistance Fund.” Proceeds from the sale of bonds issued by the authority shall be deposited in this special “Water Supply Assistance Fund.” Money in such fund shall be expended in accordance with adopted regulations and policies of the authority and may be used to provide a loan or loans for community water system supply projects or to refinance debt of community water systems or to secure principal and interest on bonds issued by the authority. Money not currently needed for the operation of the Water Supply Assistance Fund may be invested, from time to time, by the board and all interest earned on such investments shall be credited to the Water Supply Assistance Fund.