Can I dissolve mint in water and drink it? I like mint and sometimes put some in a cup of water. My question is can I grind the mint into a fine powder and dissolve it? Maybe if the water is warm? Usually mint like in this pic

just settles on top of the water and the flavor slowly seeps into the water. If I grind it up even finer will it dissolve? What should I use to grind it?
No, mint won't dissolve in water (leaves are mostly cellulose), but it does make excellent tea.
Boiling water, steep 5-6 minutes.
For best results, I recommending purchasing whole leaf mint intended for use as a tea. That way you can experiment and determine which kind of mint you feel makes the best tea (or make your own blend, I like spearmint tea with a single peppermint leaf thrown in).