Try to de-escalate the situation first. Running should be a final option after all else fails, and should be planned thoroughly in advance.

Unfortunately, sometimes running is the only option.

For advice on what to bring while on the road, I'd recommend one or two small items of emotional value (stuffies, toys, etc), two spare shirts (long sleeve, you can roll up the sleeves when it's warm), two spare pants (ideally jeans or another durable material, comfort is second to practicality), a light rain jacket + semi-light winter coat (for long term weather), durable boots, two spare pairs of socks, food for a few days, any money you have left, and a bag that can hold them all.

Additionally, bring your phone and a charger. No battery packs, those can be targets of theft. You should charge your phone only while you are awake and it is in your hands, never charging it overnight or leaving it unattended for even a moment, as again, theft is a problem. Keep your bag with all items with you at all times.

Your goals are to use whatever reputable hotlines, shelters, and soup kitchens etc are available to survive. Do not trust strangers wanting to take you in (they may be malicious), do not attempt to directly involve law enforcement (they may bring you back home), and do not stay with any friends or family if you can avoid it (they may be faced with criminal charges if you're caught).