Here is how to "Burtonize" 5 gallons of RO water:
Burton Pale Ale -- A toned-down, "idealized" profile. Enough sulphate to bring out the hops without overdoing it. Low alkalinity helps ensure proper mash pH. Model: Moshers 'Ideal Pale Ale". 1 gram baking soda, 1 gram canning salt, 3.5 grams Epsom salt, 9 grams gypsum. Ca=111, SO4=337, Mg=18, Na=35, Cl=32, CO3=38, Hardness=352, Alkalinity=31.