I did some research on plastic vs. aluminum reusable bottles. Here’s what i found:

 

The worldwide specific energy consumption is approximately 15 kilowatt-hours per kilogram of aluminum produced.

Aluminum has no known function in living cells and presents some toxic effects in elevated concentrations.

Exposure to aluminum can cause respiratory and neurological problems.

Exposure to aluminum is generally not harmful, but can be dangerous in high amounts.

The mining and processing of aluminum is extremely resource-intensive

Plastic water bottles often contain polycarbonate, which leaches BPA, a synthetic hormone that can mimic estrogen and cause prostate cancer.

Plastic water bottles are more dangerous to human health, but the manufacturing process is less energy-intensive. However, plastic is only biodegradable over a very long period of time.

 

-ryan

 

Sources:

http://en.wikipedia.org/wiki/Aluminium

http://www.atsdr.cdc.gov/tfacts22.html

http://www.grist.org/advice/ask/2006/07/12/foil/

http://www.thegoodhuman.com/2008/12/29/10-reasons-to-stop-drinking-bottled-water/

http://en.wikipedia.org/wiki/Plastic