My stereo is powered by AA batteries that I find on the street. They are kind of like cigar butts. Some are no good. Some just have a little power. But, the price is right.
I use the computers at the library myself. Do you use the library in downtown Vegas where the rest of the homeless people hang out? When I am in Vegas, I try to use the one on Sahara in Summerlin. I at least aspire to hang with the more upscale crowd.
About the gum, you must be well off so that you can use it in place of an adhesive. I use what I can find for pure chewing enjoyment. It is a form of recycling and the hard work of breaking the gum in has already been done for you.