How to put apps on an iPod which is synced with a different iTunes without losing data?

My friend came over for a week and she has an iPod touched which she synced with a different iTunes. She would like to put some new games on her iPod so that we could play on multiplayer. She doesn't want to loose the information songs and everything on her iPod. Is there anyway to only put one or two apps on the iPod without losing the data stored on it? Thanks!

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