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Mydogs,
When you keep fish in a bowl it is a normal practice to change 100% of the water. You seem to be confusing the idea of changing water in a fully cycled filtered tank - where you should change only 50% of the water, with an uncycled unfiltered tank, where you should always change 100% of the water.
Ph changes are unlikely to affect the fish if you do proper maintenance. Ph only drops over long periods of time, so regular 2-3x weekly 100% changes will result in little to no ph shift.
Life expectancy of bettas can range for 1-3 years on average, with some individuals living as much as 5-7 years.
Most bettas only live 1 year due to poor care practices by their owners.
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Never to suffer would never to have been blessed.
Edgar Allan Poe
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