These substances could include such things as amino acids, sugars, and other compounds that the plant needs. The structure of a vacuole consists of a single membrane surrounding the liquid or solid contents inside. You people are annoying. Not the ones asking questions but the ones being really stupid and swearing. Think before calling other people stupid.
Vacuoles are simply just storage bins.
They store things such as wastes and nutrients. A cell will break into a vacuole when what is inside is needed. If it contains waste, then it will simply hold on to it until it is able to rid itself of it. Vacuoles act as containers. A food vacuole in a single celled amoeba contains the food item that the amoeba has consumed.