3. Use a water filter instead of drinking bottled water. Most of us are aware that there is a problem with excessive plastic waste in the world, and that individual bottles of water are a large part of that problem. Luckily, this is a pretty easy one to remedy at home, either by installing an undersink filter or using a pitcher filter. If you like chilled water, just fill a glass pitcher from your newly filtered tap and store it in the fridge.Ready to take it a step further? Fill your own water bottle to bring on outings, so you won't be tempted to buy a bottle while you are out.