Most teas labeled "good for digestion" contain gluten. For some reason, malted barley gets tucked into tea bags as the digestion helper. Since barley is not one of the 8 mandatory allergens that must be disclosed (in the USA), it is often hard to know which teas are safe - I am staring you down "natural flavorings". For the most part, I grab some ginger chews and forgo the landmine of packaged teas.
A little inspiration from a local blog, and I decided to create my own winter mix.
1 part dried elderberry (immune system support)
1 part dried milk thistle (supports liver function)
1 part dried rose hips (high in vitamin c)
1 part dried hibiscus flours (beautiful red color)
1 part dried orange peel (tastes awesome)
0.5 part dried ginger root (pieces, not ground), the digestive aid
The resulting "tea"* really needs to steep for 5-10 minutes. It is a little peppery from the ginger and has a great bright right color with a gentle sourness; you can add some honey to round out the flavor. I hand-filled some teabags and you can see in the back I store them in a zip-lock. The rest I saved for when I am at home can can use a metal brew basket.
*Technically a tea has to include actual tea leaves, but I am going to take the vernacular liberties here.
KABLAM - the result tastes awesome and doesn't ironically cause digestive unrest.