Anybody with a router is likely setting up, or already has set up intelligence gathering tools.
As demonstrated in CHAZ, some clever folks set up free WIFI points around the area and snared quite a few ANTIFA/BLM/JBGC. They created a map of who was communicating with who.
OPSEC dictates probably the best strategy is to leave your phone at home, but nothing is perfect.
I would also take the time to encrypt your phone contents and set up an actual password, not face unlock or fingerprint. If you get picked up by LEO, remember your right to not self incriminate, enumerated in the Fifth Amendment.
Food and water would be essential items to bring with you, bring plenty for yourself and some to share if you want. A small first aid kit wouldn't be a horrible idea either.
Stay together, make plans and backup plans and rally points if you get separated from your group.
God bless you and be safe. I'll meet you all there.
EDIT: the comments here have excellent suggestions, I only watched a couple DEFCON videos a few years ago about WIFI activity being intercepted for intelligence gathering purposes. Heed the advice of people more knowledgeable than myself.
Burner Phone is the best bet for at hand comms. Your main phone should be powered off and if the battery can not be removed: a faraday type bag should be used.
Here's my problem with burner phones - yes, they can't personally identify you but even if you have a burner phone they can tag you and track your movement - so if you start out with a group and you get tagged with that group, they have a significant tactical advantage knowing where you're headed, when you're isolated, etc.
They don't need to know who you are individually, they just need to associate you with a group and track you like a flock of geese.
You know what else does that?
Eyeballs.
Eyeballs do not put unique identifiers on large groups of people. Eyeballs cannot track a large group of people as they move in separate groups across the city. Eyeballs do not give your physical location within 11.8 inches. Eyeballs cannot track you through walls, under bridges, or behind obstructions. Phones can.