Wow, never heard of using baking soda in tea. I often make sun tea. I'm trying to cut out the sugar so I put a little honey into it instead--one generous squirt for each teabag. The honey dissolves as the tea warmly brews in the sunshine. I generally use four tea bags in a quart of water in a glass container. I keep it in the fridge and it tastes great for just as long as I need it.