Logitech keys-to-go has proven itself to be an exceptionally portable and coffee resistant choice. Although I did cut back on coffee lately. But that's just me.
Buy one directly from Logitech or from Amazon. Link to be added here later on.
Other bluetooth keyboards should work fine too. And if you want to use a laptop, Chromebooks are a viable option. Since SJ is an Android app, by extension, it works on Chromebook too since Chromebooks can run Android apps.
For keyboard shortcuts check the Settings screen menu.