replacement for orig Nook Glowlight Plus?

Hi! Looking to replace my dead Glowlight+ (original 6" model). Main features I want are: 6" screen, native epub support (no Kindle), front light. Don't need sd card, waterproof/resistant would be a plus. Buttons or touchscreen ok, older used/refurb models ok too, any brand with acceptable display quality. Just wanna sideload my book files and read them, sometimes in the pool.

Thanks in advance for any suggestions! Have not looked at e-readers for some time now.