Thanks @1bit!
I looked into the forum for a step down buck and found here Photon Power Supply Idea that I might need to add caps to avoid damaging the Photon.
After looking on adafruits, I was considering buying this https://www.adafruit.com/products/1385?gclid=CjwKEAiAj7TCBRCp2Z22ue-zrj4SJACG7SBEEI3fYRae2EHf-hc9C3C8gS1-qp8sRaVm1s7C40g7JRoCdVHw_wcB
Do you think I would still need to add caps?