Kombucha question and a baking soda follow up question

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Last winter my friend gave me a mother mushroom which produced several

very good batches of kombucha tea. I've got several bottles of it,

both beer-type bottles and half-gallon Mason jars full of it. They

were bottled in January and March of this year. They look nice and

clear, not cloudy nor do they have mushrooms growing in them. Do you

think they are still drinkable? It was the earlier posts about

kombucha that made me remember that I still had them.

There was a thread last week about indigestion and a baking soda test.

What was the test? The only thing I could find as a follow-up was

something vague about taking 1/4 tsp in water in the morning. What was

the deal with the burp? Sounded like the elapsed time between drinking

and burping was supposed to mean something. Hubby has serious

indigestion, heartburn, burping and winds. Have made the switch from

the purple pill and that genre to Nux Vomica with better than expected

results, but there's still a problem.

Thanks.

Sharon