Here are some Magnetic Water Conditioner & Cup that you can choose from,
Magnetic Therapy magnets
You can read what is being cautioned by this website for your information;
Usage Warnings:
Persons fitted with pacemakers, defibrillators, implanted insulin pumps or other electro-medical devices should keep magnetic therapy products at least 18"(45cm) from the device. 
Read More....Do not place magnetic therapy products in direct contact with computer discs, audio/video tapes and credit cards. Pregnant women should consult their health care professional before using magnetic therapy products.
The information on this Web site or in emails is designed for educational purposes only. It is not intended to be a substitute for informed medical advice or care. You should not use this information to diagnose or treat any health problems or illnesses without consulting your pediatrician or family doctor.
Please consult a doctor with any questions or concerns you might have regarding you or your child's condition. Informational material and representations have been provided by the manufacturers of the listed products.
In accordance with FDA regulation we do not make any therapeutic claims regarding the health benefits of any Magnetic Therapy Products. (Full Disclaimer and Usage Warnings)
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