If you are in most any 'populated' area, good look bugging out. It might be more like banding with some neighbors to secure a compound and share resources, in place. In fringe areas or rural and you have access to a secure bug out place, lots of luck getting there. Either way, sooner or later someone(s) will want to join you (or your group) or take you over (or take your stuff).
If you are bugging out and do not have prepositioned stuff, good luck on what you can take with you.
Water and food, medical supplies, shelter, fuel, proper clothing, bartering material, communication equipment, and a host of other things will compete with arms and ammo. You can only take so much stuff.
Different situations will dictate different solutions. Your best guesses will be usurped by a situation that you probably did not consider, but having some kind of plan and prep is better that none at all.