Rena,
I hope your father is not spending $$$ to buy alkaline water. There is no evidence whatsoever that it provides any benefit. Our digestive system is extremely acidic. There is nothing we can eat or drink to neutralize that acidity.
Mayo Clinic nutritionist on alkaline water
http://www.mayoclinic.com/health/alkaline-water/AN01800
Alkaline Diet: What to Know Before Trying It
http://www.webmd.com/diet/features/alkaline-diets-what-to-know
If he feels strongly about alkaline water, he can make his own virtually for free. Just add some baking soda to regular water. Or he can take TUMS pills with water.
Best wishes,
Eli