I agree with Notjohn, you don't want to force your desire for a particular font onto the reader....
...UNLESS...
... that particular font is specifically needed to help tell the story. Those should be few and far between...such as chapter headings or specific parts of a chapter or image. In such a case, you definitely need to embed the font so it is guaranteed to be available to the epub. Be aware that there are some devices out there that won't pay attention to your styling anyway.....
Also, just fyi, make sure you are using the correct syntax for your font. You need comma's between the font options, not semi-colons:
font-family: "Bitter", "Caecilia", serif;
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