Sec. 4. (a) To provide money for the fund, the board may place in the fund the following:
(1) Gifts or grants from a person or state or federal agency.
(2) Receipts of revenue from the sale of services or property produced incident to the accomplishment of the purpose for which the district is organized.
(3) Any other form of miscellaneous receipt, including tap-in fees and connection fees.
(4) Levy of a special benefits tax in accordance with sections 5 through 10 of this chapter.
(5) Collection of the exceptional benefits assessments or installments of the assessments, but only in accordance with section 11 of this chapter.
(b) The board shall state in the district plan or part of or amendment to the plan the source or combination of sources that will finance the fund.