
I would suggest getting your own water bottle and using your own filtered water vs buying plastic water bottles everyday. Not only are the costly but studies have shown that there isn't much difference between filtered tap water and bottled water from the store other than the price. See for yourself here http://hubpages.com/hub/Drinking-Filtered-Water-Vs-Drinking-Bottled-Water and http://www.waterfiltercomparisons.com/bottled_water_vs_filtered_water.php
Here are some examples of different water bottles. You are sure to find one that fits your needs.
I could go on and on about the benefits of drinking water but for now, Get to drinking!