What's the one thing you can't live without?

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I can't live without my mobile/cellular phone because it is my main means of communication with my boyfriend, friends and family. It is also where companies call me to set up interviews. My mobile phone also serves as my "watch" (since I don't wear a watch) I check the time through my mobile phone. My mobile phone also serves as my appointment book and it alarms to remind me of things I need to do, medicine i need to take and dates I have to go to. My mobile phone also serves as a camera to capture those special moments in my life. So for me, it's really a necessity. How bout you, what is the one thing you can't live without? Share your thoughts, I'd appreciate it...please answer a thing not something profound like Love, peace or something = ) Thanks