Until non-Tesla chargers have NACS capability cars with NACS ports, including Teslas, will need an adapter to charge everywhere. Tesla sells a CCS adapter for $250 and a J1772 adapter for $50. Older Teslas require a retrofit to use the CCS adapter. It cost $350 for the retrofit, which included labor and the adapter, for our 2018 Model 3.
Even with an adapter, non-Teslas will not be able to use older Tesla Superchargers until those Superchargers are upgraded. See the Ford announcement. There are still a lot of Superchargers which haven't been upgraded. Plugshare show whether a Supercharger location is open to other makes, although it may not be up to date.
Right now my Tesla can charge at almost any public charger. It's going to be a while before other makes catch up.