Can a plastic water bottle actually save water?

We have heard the horrible stories about plastic water bottles turning up in our oceans and streams damaging the ecosystems. They were initially developed to last forever and thats how they will exist. The first option is to purchase a refillable glass or stainless steel water bottle instead. You can buy SIGG Stainless, SIGG USA bottles at most REI stores, or Klean Kanteen which is also a great brand if you want to kick the plastic bottle habit (BPA free is a good thing).
Ok, what if you just so happen to be really thirsty and buy some of that fresh mountain spring water that comes in the plastic bottle? Instead of sending it to the landfill you can either recycle it or save some green (money that is).
Home Green Solution:
1. Take the bottle (drink that tasty flavored water inside).
2. Then fill it with your highly chlorinated tap water.
3. Remove the labeling with soap and water.
4. Stick the bottle in your water consuming toilet and BAM! Low flow toilet.
How is this a low flow toilet? Every time you flush the the toilet, water fills back into the basin ready for the next flush. The typical older toilet uses about 3.5 gpf (gallons per flush) and toilets consume an average of 20.1 gallons of water per person, per day in a home with no water-conserving fixtures, according to the American Water Works Association.
Little Math: 4 Person family = 20×4 gallons of water per day= 29,120 Gallons per year. Water rates vary, but for this lets use .031c per gallon = $902 per year to flush this toilet. By using a typical 1/2 liter plastic bottle you can reduce your fill level by around .3 gpf.
This toilet saved: $50/year by using a $.43c water bottle. (**Note: This calculation is only an estimate to demonstrate even the small things make a difference).

Dual flush converter
If everyone that reads this either buys a new low flow or dual flush toilet ($100-$$$), a dual flush toilet converter by (Hydroright) $17, or a .43c water bottle its a step in the right direction while saving water and money.
Happy flushing!