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If you want to eyeball a well formed epub 2 or epub 3 you could use Calibre's editor or Sigil; I use the latter. Add an h2 at the start of each file. Then, in Sigil, use Ctl-T to generate a table of contents from the h2 tags. I prefer to make epub 3s so after I generate the table of contents, in Sigil's Tools menu I run the first two items in the Tools > Epub 3 tools menu; Generate ... and Update ... so that I get the optional fallback that jhowell mentioned. With Sigil you can have it start a new epub as either epub 3 or epub 2
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