Take a look at the Logitech G600. It has 12 side buttons and a shift mode that lets you map 12 more actions to those buttons. It has onboard memory rather than needing a companion app. Linux compatibility is great as it can be programmed with Piper. Only downside is it’s a bit large if you have smaller hands.

I like to add a splash of cocktail bitters to soda stream water. A bit of fresh fruit and herbs is nice too.