When & How Often & How Much ?: Lime and/or Gypsum. Aqueduct ?

Hi everyone.

I have bags of pelletized gypsum and bags of Encap Lime. Haven't applied either in over a year. How much to apply of each and how often ? Which will help in a water shortage, if either.

Anyone ever used "Aqueduct" granules ? Will it help in a water shortage ?