I will add this note to the back of the card I attach to the water bottle gift:
"Right now, almost a billion people on the planet don’t have access to clean, safe drinking water. That’s one in eight of us.
charity: water is a non-profit organization bringing clean, safe drinking water to people in developing nations. We use 100% of public donations to directly fund sustainable water solutions in areas of greatest need. Just $20 can give one person clean water for 20 years."