The word "wast on" is not commonly used in English language, and therefore, antonyms for this term cannot be accurately determined. However, assuming the intended word was "waste", antonyms could include: save, conserve, utilize, economize, or optimize. These antonyms denote an efficient use of resources or items, as opposed to squandering or depleting them. By applying these antonyms, one can avoid unnecessary expenditure of money, time, and resources, while still achieving their objectives or goals. For instance, individuals can conserve water by utilizing low-flow faucets, which help in minimizing wastage and reduce their monthly water bills. In brief, the antonyms for "wast on" likely refer to efficient use, conservation, and optimization of resources.