G'day folks,
The local stockfeed/rural supplies joint here has Molasses in 5kg lidded buckets, too. 1+10 Molasses to water ratio has worked well for me also.
One tip: to make up the solution, weigh up the Molasses 1 or 2 kg at a time, directly into a standard 9L plastic bucket [most electronic kitchen scales will handle this total weight], then add water from the hot tap, and stir it up with a paint mixer in the leccy drill.
These 'drill paint mixers' are about $5 from Supercrap Auto.