Give Up Bottled Water & Save Big. Give up those plastic containers, and save about $1,250 a year. That’s how much a four-person family spends if buying sixteen $1.50 20-ounce bottles of water a week (whether for the kids’ lunches, your commute, workouts, running errands, etc.). You can all drink your full 64 ounces of water a day — an astounding $2,190 if bottled — from the faucet for a total of $2 a year, and it only takes seconds to fill up a glass or a reusable plastic water bottle. Worried about contaminants? Invest in a faucet-mounted filter for a low $30 (iStock).