First off, thank-you Dr. Joseph for being so kind and generous, offering to answer our health related questions!

My husband has had kidney stone problems and back in July 2019 had a very severe attack taking him to the edge and creating a fear of it happening again.

What is your best advise for preventing kidney stones?

My husband is 73 years old, on no medications and is generally in good health. Over a year ago he went on a Keto diet because of his concern for the extra weight he had and fear of having a fatty liver. He has had Hepatitis A which may have weakened his liver.

He has lost the weight and is happy with our diet of low carbohydrates, high fat and moderate protein. My husband includes the "Bullet Coffee"with this diet consisting of a very good coffee, ghee, MCT oil and a dash of salt and a few drops of liquid stevia.
We are facing a bit of a dilemma over the coffee with the caffeine and being a diuretic (where he wants to increase his fluid intake because of the possibility of kidney stones))
He enjoys his coffee and believe it is a good carrier for his supplements.
What is your take on this?