Instead of reaching for that Deer Park or Dasani bottle in the morning, try reaching for this instead! A glass or plastic reusable bottle holds just as much water, or more. Plus, don't worry about having to throw it away, just refill it that night and put it in the fridge for tomorrow!
Buying a High Efficiency appliance can really help lower your energy output and your costs. HE fridges can even usually hold more food and keep it fresher, HE washers use less detergent, HE dishwashers use less water, and so on.
A lot of cafes and such have standard size drinks. Bring in a standard-size reusable cup or mug and that saves a cardboard one from going into a landfill--plus, they might take off about 10 cents from your purchase! After all, a penny saved is a penny earned!
Consider Tupperware! For children's school lunches, many places sell lunch box size containers. Leftovers can be stored also. You can even store some in your car for when you want to take food home from a restaurant! Skip the plastic bags and styrofoam and go for a Rubbermaid or a Tupperware!