I've tried a lot and I still think San Pellegrino is a winner. The bit of mineralization and how bubbly it is ... is perfect IMO. I used to drink the full 1L by myself in one go.
I do like San Pellegrino and a bonus feature is that they are available at Costco. I buy the glass bottles, not plastic, as I don't want more plastics in my water.
When travelling, I've come to really appreciate Singha soda. I'll be looking for it back at home, as it has a nice strong bubble, and is delicious - especially when ice cold.