Using public wifi is a way of sites not letting you in. You talked about “dirty” IPs being used and using Public Wifi is a great way to end up with one of those because anyone can use it.
If services are not letting you in, it’s either because the wifi is blocking certain things, or because they don’t like where you’re coming from. You’re experiencing the same issue you are trying to avoid by not using a VPN. Unless this network also blocks VPNs (they might) you want a reputable VPN like Private Internet Access, but since you seem to be non trusting of this, I’m not sure what to tell you.
Using public wifi is a way of sites not letting you in. You talked about “dirty” IPs being used and using Public Wifi is a great way to end up with one of those because anyone can use it.
If services are not letting you in, it’s either because the wifi is blocking certain things, or because they don’t like where you’re coming from. You’re experiencing the same issue you are trying to avoid by not using a VPN. Unless this network also blocks VPNs (they might) you want a reputable VPN like Private Internet Access, but since you seem to be non trusting of this, I’m not sure what to tell you.