Compare cost and environmental impact of your water source.
Bottled water costs 300-2,000× more per liter than tap water. In the US, tap water costs $0.002/L while bottled averages $1-3/L. A person drinking 2L/day spends $1,000-2,000/year on bottled water versus $1.50 on tap. The bottled water industry generates $350 billion globally. Despite marketing, 25-40% of bottled water is simply filtered municipal tap water (including brands like Aquafina and Dasani). Tap water in developed countries is actually more strictly regulated than bottled: the EPA mandates hundreds of tests daily, while the FDA requires only weekly testing for bottled water. Each plastic bottle requires 3× its volume in water to manufacture. The energy to produce, fill, transport, and chill one bottle equals filling it 1/4 with oil. A home water filter ($30-50/year) provides the same or better filtration as most bottled brands while generating near-zero waste.