considerations for visitors who may resort to not carrying enough water or drinking from surface water sources with potential exposure to disease. (M) Any input from concessioners and cooperating associations within the unit. (2) Units of National Park System that have previously eliminated sale water in disposable plastic bottles With respect to a unit of the National Park System that does not offer for sale water in disposable plastic bottles on the date prior to the date of the enactment of this Act, the superintendent of such unit may continue to not offer for sale water in disposable plastic bottles if such superintendent, not later than 180 days after the date of the enactment of this Act, submits to the regional director of such unit an evaluation that analyzes and addresses the factors listed in subparagraphs (A) through (M) of paragraph (1). (c) Proactive visitor education strategy Each regional director concerned shall develop for such unit of the National Park System a proactive visitor education strategy that addresses visitor expectations of water availability and explains the rationale for the program for recycling and reduction of disposable plastic bottles established under subsection (a) and implemented in such unit. (d) Continuity within unit of the National Park System Each regional director concerned shall, to the extent possible, implement the program for recycling and reduction of disposable plastic bottles established under subsection (a) in a manner that is consistent throughout such unit of the National Park System, including incorporation of such program into any agreement with an organization operating within the unit, including a concessioner operating plan and cooperating association scope of sales. (e) Bi-Annual evaluation Each regional director concerned shall, not less than once every 2 years— (1) conduct an evaluation of the program for recycling and reduction of disposable plastic bottles established under subsection (a) for such unit of the National Park System, including— (A)