The state may provide assistance, as funds are available, pursuant to this chapter, to any county, municipality, public water district, public sewer district, or any combination of the same, or any entity eligible pursuant to the Safe Drinking Water Act, as amended, or the Clean Water Act, as amended, to assist them in the construction of public drinking water and water pollution control projects as authorized by the clean water commission. The state may provide assistance pursuant to this chapter, including but not limited to the purchase of water and/or wastewater revenue or general obligation bonds, bonds of any county, instrumentality of the state, state entity, municipality, public sewer district, public water district, community water system, nonprofit noncommunity water system or any combination of the same, or any entity eligible pursuant to the Safe Drinking Water Act, as amended, or the Clean Water Act, as amended. Further, the state may provide additional assistance or subsidies to any eligible entity as described in this section in the form of principal forgiveness, negative interest loans, grants, or any combination thereof, to the extent allowed by the American Recovery and Reinvestment Act of 2009, as enacted by the 111th United States Congress, and within the process provided by the Missouri Constitution and revised statutes of the state of Missouri.