Firstly, I am almost certain that UNetbootin would not work on Mac OS X via Wine - Mac OS X and Windows have different bootloaders, and I don't think syslinux works via Wine.
That said, UNetbootin doesn't request any specific font to be used; your system default is used. Thus, if you have the Microsoft Truetype Core Fonts installed, which you can get for non-Windows OSes at
http://corefonts.sourceforge.net/ (fink, macports, or whatever package manager you used to install Wine should probably have installed them), then you should have whatever system font Wine defaults to.
If you're not getting text displayed, it's probably a Wine rendering issue, not an issue with missing fonts.
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