Can I take Pepto bismol with amoxicillin- potassium clavulanate? Upset stomach non related to the antibiotics..

YES. however, amox/clav is famous for causing Always take on a full stomach. GI upset.
Yes. I would not take pepto at the same time as the Augmentin. Wait 30 minutes or so, but OK to take pepto while using Augmentin.