iPhone and multiple iTunes libraries?

Me

Active member
Does anyone know if there is anyway to be able to hook up the iPhone to multiple computers iTunes without loosing all my music and to be able to get music off their library?
Because this really sucks cause my little sister ruined my laptop and I have a lot of music on my iPod right now but I wanted to put a few more songs on like quite a few more songs but I don't want to have to rebuy all the sings I've already bought because that would really suck so if theirs anyway to make it so I can even if I have to buy softwear please let me know if you know.
 
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