Years ago People Magazine used to contain one article per issue that was not about a Hollywood celebrity. One time the article was about The Voice (or Throat) Doctor to the Country Stars.

The good doctor said right upfront that country stars get throat problems because they don't know how to sing right. I can't recall his exact words, but mostly they push their poor voices too hard, doing too many concerts too close together using bad techniques and no training.

Adele is another example of trying to push an amateur's voice to a professional's pace. This could have been avoided; we know it happens.
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I remember another thing the doctor said. When your voice is sore, avoid drying the throat. No alcohol, caffeine or chocolate.

My SIL's advice has proven good over the years - drink lukewarm water.

Not talking in a loud car is a good bit of advice. Presumably by the time one is singing to 98,000 people one can afford a quiet car.

Adele mentioned clearing her throat in the article. I hope she knew this - a singer never clears the throat. If there's sludge, cough it away.
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Thanks for your insights, Bonnie. They are well worth a read.