Acetone is usually used to wash and dry glassware in the laboratory. While it is acceptable to flush wash acetone down the drain, provided plenty of water is used to dilute it and reduce the possibility of fire, collect your wash acetone in a beaker and dispose of it in the container specifically designated for wash acetone. Take only as much of the reagents as you need. In the event you have any excess reagent left over, ask your instructor how to dispose of it properly. Accidental contamination of reagents is not only unfair to your colleagues, it can be down-right dangerous.
Potassium permanganate in contact with glycerol and other organics can spontaneously ignite.
Ingestion of chemicals can occur in several obvious and some less obvious mechanisms. The tasting of laboratory chemicals, once a common practice, is no longer an acceptable practice. Many organic solvents are quite volatile and a common exposure to these substances is through the lungs. The vapors of some common solvents such as the simple halogenated methanes, can cause liver damage and some are suspected of being carcinogenic. Avoid breathing the vapors of these materials and always work with these materials in a well ventilated area such as a hood.