If you want simple and effective then use 200g Ammonium Thiosulphate and 20g Potassium or Sodium Metabisulphite, alternately use the Agfa 304 formula which is

Agfa 304 Rapid Fixer

Sodium Thiosulphate 200g
Ammonium Chloride 50g
Potassium Metabisulphite 20g
Water to 1 litre

For films and papers.

(Note this is an Agfa /Orwo formula and not Agfa Ansco/GAF)