No... cans can be thrown away, and arnt nearly as heavy as bottles nor can they break. which is why cans are good.... you can fit around 3 cans to each soda bottle in a garbage bag and they wont break on you.
i have a buncha the new gatorade bottles with the turn open cap that i carry around school with water. cant find those bottles here though o.O only found them on trip to Vancouver and back
For computers, buying cheaply and often will only leave you constantly in a world of shit.