

Hi!
Just recently was setting up my whole family with ebooks. Ended up with Kobo Libra Colour for myself and Kindle Oasis (jailbreaked) for family.
I am quite happy with both readers. Kindle would be a bit better in quality, but Kobo is color and non-amazon. Both of them have physical side buttons, which were my main requirement.
I store all my books in calibre and uploading it via USB on my kobo reader. It makes it much easier to manage and confirm metadata. I didn’t bother with readarr, as I already has a decent collection that still need to finish.
For family - they were already familiar with Kindle, so I got them Oasises from ebay, jailbroke them to prevent Amazon from messing up with them and just send all necessary book to their readers wirelessly via Send to Kindle.


Here is my set up. This one is pricey initially, but checks all your requirements: Breville InFizz Fusion - mechanical (no need for batteries and has no wires), sturdy and designed to carbonate any liquid, not just water (the taste in this case is significantly better than just adding carbonated water into the drink). The CO2 tanks are compatible with old sodastream, which has multiple generic alternatives.
I also got myself a 10lbs CO2 cylinder and refill adapter woth hose on amazon, so I am refilling smaller tanks myself from it and refill the large tank once every 1-2 years in local welding supply store for $40.
I do recommend to have around 4-5 small tanks and 2 extra bottles for different sodas.