Fla. Stat. § 373.506

If it should appear necessary to procure funds with which to pay the expenses of a district, or to meet emergencies, before a sufficient sum can be obtained from the collection of the tax, the board may borrow a sufficient amount of money to pay expenses and to meet emergencies and may issue interest-bearing negotiable notes therefor and pledge the proceeds of the tax imposed under the provisions of this chapter for the repayment thereof. Said board may issue to any person performing work or services or furnishing anything of value interest-bearing negotiable evidence of debt.