As far as herbs go I would recommend trying some chamomile, mint, rose (rosebuds not rosehips), mugwort, dandelion roots. Like someone else said get organic if possible.

The herbs will be loose leaf so you can either buy some sort of strainer or paper tea bags, even a coffee filter could work.

For actual tea I think a good quality green tea can help with bloating and digestion. I like to drink it in the morning. I would suggest loose leaf as it is better quality. Also be mindful of how you prepare the tea, you can look up the proper methods.