The commissioners court may authorize a district, by a lease, lease-purchase agreement, installment purchase contract, or other agreement, or by the imposition or assessment of a tax, user fee, concession, rental, or other revenue or resource of the district, to provide for or secure the payment or repayment of:
(1) the costs and expenses of the establishment, administration, and operation of the district;
(2) the district's costs or share of costs of an improvement project; or
(3) the district's contractual obligations or indebtedness.