Peppermint and ginger are both things that help settle an upset stomach. I would suggest looking into a quality loose tisane (or even making your own) with one or both of these two things because the teabags you buy in the store are either going to be flavored, old or just bad quality.
OID - Medication once a day [Internet]; August 7, 2016 [cited 2016 AUG 7]. Available from: https://www.allacronyms.com/OID/Medication_once_a_day. 'OID - Medication once a day', All Acronyms, 7 August 2016, <https://www.allacronyms.com/OID/Medication_once_a_day> [accessed 7 August 2016] All Acronyms, OID - Medication once a day (Aug. 7, 2016, 4:08 PM), available at https://www.allacronyms.com/OID/Medication_once_a_day.
Medications administered more frequently than daily but not more frequently than every 4 hours (e.g., BID, TID, q4h, q6h) Administer these medications plus or minus 1 hour from the scheduled time. Medications administered more frequently than every 4 hours (e.g., q1h, q2h, q3h) Administer these medications within 25% of the dosing interval (e.g., plus or minus 15 minutes for hourly doses, plus or minus 30 minutes for every 2 hours dosing, plus or minus 45 minutes for every 3 hours dosing).