I am yet to try this but logic dictates the following:
There appears 2 ways to make beer for DIY Craft beer smaller tanks.
1. If using Coopers Craft 1.3 kg recipes – don’t add extra sugar in tank as sugar already mixed into the recipe.
Costs approx Aus $1 per 740 ml bottle
2. If using other 1.7 – 1.8 kg recipes - then split into exactly 2 halves & store one half in air tight sterilised container in fridge for future batch. Use other half to make brew. Use stored half as soon as first half is bottled.
When ready to brew recipe, mix in tank and add 500 g sugar.
Will need to obtain & add yeast to second half of recipe as recipes only come with one serving of yeast. Use brewing yeast only.
Costs approx Aus $0.50c per 740 ml bottle.
Hope this helps.
Would love to hear the results from anyone who tries this halving recipe.