Over the past 25 years, more underserved communities have gained greater access to clean water, but the disparities still remain vast between rich and poor areas. Across the globe, 663 million people are living without potable water, an injustice that has serious consequences, particularly for young people. Waterborne illnesses remain a leading cause of death for children under 5, killing one kid per minute. As World Water Week -- an advocacy event at which leaders brainstorm innovative solutions -- gets underway, photographer Ashley Gilbertson released a photo series, spanning seven countries, to demonstrate the discrepancies in water consumption across families worldwide.