Kids freak out over not getting to watch their favorite show on TV, and they pick up on the emotions of those around them real quick, which just adds to everything. I can't imagine how bad it will be for our daughters twins. I've included feel good stuff for them. They are still very young, but have favorite toys and as that changes, I'll change what's in the BOB. A favorite blanket, pillow, book and food will all help her and your wife get through the fear and panic sessions much easier, not to mention you, because it just seems that the guy is the one that stresses over everything, especially when he can't do anything to help.
Ear plugs may be needed, a mask for each of you that will filter biological hazzards, surgical gloves, protective glasses and other protective gear.
I don't know if I would have your daughter drink too much iodine. Pick up some of the Katadyn Micropur MP-1 water purification tablets. They are the best you can use.
Do you and your wife shoot/own guns? If you are forced to walk the streets with the masses, or are bugging out in your vehicle, there will always be those that will be preying on the people that seem to have their stuff together. You will want to be able to protect your family. Too many will hope that there are plenty of law enforcement around to protect them, but in an emergency, that responsibility belongs to you and your wife.
Hadn't thought about toys or anything for the little one yet. Have to get something together. She loves to color so that might work.
The Iodine tabs are a last resort as I prefer to use the MSR waterworks filter.
We do own and shoot guns and the Glock 23 and a Mossberg shotgun are part of the plan. Neither my wife or I have any qualms about defending ourselves or our family. Never been an issue. Don't own a decent rifle for that purpose yet but am hoping to remedy that in the somewhat near future.
Thanks,
Charles