Bitter herbs such as Swedish Bitters or Grape Bitters without alcohol, kefir, and HCL. These helped me reach a Candida cure without nearly as much intestinal digestive trouble as many others experience.

I agree.  Bitters are much better than digestive enzymes.  Unlike digestive enzymes, bitters will not reduce the body's own ability to produce digestive enzymes. Instead, bitters work by stimulating the vagus nerve to increase the release of the body's own digestive enzymes, stomach acid and bile for digestion.  In the process the bitters also stimulate cleansing of the liver.  

The only real drawback to most bitters though is that many of them contain stimulant laxatives and berberine herbs.  Stimulant laxatives (senna, cascara sagrada, rhubarb root, aloes)  can weaken the intestinal muscles in as little as a few weeks leading to a laxative dependence.  Berberine herbs (goldenseal, barberry, Oregon grape root, coptis, etc) destroy the intestinal flora and can damage the intestinal lining with continued use.  There is a simple way around these problems though.  Don't follow the directions on the bottle.  Most bitters recommend a whole teaspoon of the liquid.  This is way more than is needed.  Bitters work by stimulating the bitter receptors on the tongue, which in turn stimulates the vagus nerve.  So all that is needed is enough to taste the bitterness.  This is why I only recommend a half a dropper full of the bitters on the tongue before, during or after meals. This does not provide enough of the anthraquinone containing stimulant laxatives nor enough berberine to cause problems. Remember to also drink plenty of water throughout the day when using bitters because of the liver cleansing effects.

Another drawback to digestive enzymes is that they also contain betaine HCl and the enzymes cellulase, hemicellulase and sometimes pectinase.  As with the substitutes of the body's own digestive enzymes reducing the body's own output, betaine HCl also shuts down the body's own production of hydrochloric acid with long term use.  Cellulase and hemicellulase I covered in this post:

http://curezone.com/forums/fm.asp?i=1555407#i

Pectinase poses the same problem.

 The only bitters I know is Angostura bitters but it has alcohol. Could it be used?

Yes, these can be used the same way.  In fact the original bitters were after dinner drinks to help with indigestion.