Bubble juice concentrates are mixtures to which you add water or water plus a pH adjuster for the final juice. These are convenient because they require less storage space. Uncle Bubble Ultra Concentrate is a popular commercial bubble concentrate.
For brewing your own concentrates, there are a few considerations. Some polymers require more water than others to remain stable and fully-suspended over long periods of time. PEO lends itself well to highly-concentrated concentrates whereas guar gum and HEC do not. eGoo, a PEO-based mix, is a highly-concentrated recipe that can be diluted at dilutions of 12 parts water to one part concentrate to more than 16 parts to 1 part! By contrast, my best HEC concentrate dilutes at just 3 parts water to 1 part concentrate.
All articles in the Concentrates category. You will find some blog entries about my attempts to make super-concentrated mixes with various polymers.