I need something to prepare sparkling water at home.\r\nAny ideas, please?

Did you try Kayser soda siphon? I've tried it once or twice while travelling abroad, and it seems rather good to me.

how about a classic sodastream? or a soda water dispenser?

Yes, Brown! You are right, you don't need anything special to make sparkling water, just a usual method!

I believe simple methods are always the best. You don;t need to remember a lot and you cannot spoil anything