BarbicideDisinfectant 16oz Conc

Do you add water to make up a solution or do you just use it in its concentrated form? If you do have to add water, how much do you a have to add?

Does the bottle have an expiration date?

Can this be used to clean makeup brushes?

what's the normal use? do you mix up a batch, leave it sit for 6 months and disinfect something every few days? or do you dump it after 1 use?