For general purpose developing, Ilford MG developer, for cheapness and ease of use, any one of the Dektol recipies mixed from raw chemicals.
Stop bath, a teaspoon or two of citric acid in a litre of water - Citric acid is available from most chemists, home-brew shops or decent supermarkets along side other baking ingredients.

Fixer - Champion Amfix is probably the cheapest in these parts and 5l doesn't cost much more than a leading brand 1l bottles.