Markup
Just add data-role="tagsinput" to your input field to automatically change it to a tags input field.
Typeahead
Typeahead is not included in Bootstrap 3, so you'll have to include your own typeahead library. I'd recommed typeahead.js. An example of using this is shown below.
True multi value
Use a <select multiple /> as your input element for a tags input, to gain true multivalue support. Instead of a comma separated string, the values will be set in an array. Existing <option />elements will automatically be set as tags. This makes it also possible to create tags containing a comma.
Categorizing tags
You can set a fixed css class for your tags, or determine dynamically by providing a custom function.