I find practising everyday, no matter how little it is, really helps me improve my mental health and also helps me become a better musician. You do not need a real instrument to practise on. I carry a little drum pad and drum sticks when I can't use my drums. Below I share all materials shown on my YouTube channel – Dr Taichi Imanishi Drums and Percussion Tutorial.
Episode 1. How to hold drums sticks – different grip styles:
Episode 4. How to play double strokes
Episode 2. How to Set Up the Snare Drum:
Episode 5. How to play paraddidles
Episode 3: Snare Drum Basic Exercise 1:
Episode 6. How to play accented notes