I'm looking for some advise on a 7 day tour I'm going to try shortly.

What to pack: I have a list from the tour but I don't have rain gear. Any inexpensive options here? Do you also bring shoe covers (I hate riding in wet shoes).

I most likely will have to ride with my 4yo in the trailer for a portion of it. Any tips to make that part of the trip more enjoyable for both of us and any additional items I need to bring besides his clothes and a car seat (I'm anticipating some quality time in the sag vehicle as I've been sidelined for a couple of weeks since my crash).

Average meal cost is $4-5 for breakfast and $6-7 for supper. How much money do you bring for the week and is it all cash? Do you carry it all on you all the time?

Here's the packing list:
helmet, underwear, toiletries and soap, handlebar/seat bag, shirts, towel and wash cloth, frame mounted tire pump, shorts, tent and ground cloth, bike lock, lightweight jacket, sleeping pad/thermarest is best, 2 large water bottles, 1 pair of pants, flashlight with fresh batteries, rain gear, spare tube, tire tools, patch kit, cycling shoes, cycling gloves, off bike shoes, ID and insurance card, insect spray, mediacation, foam earplugs, money and more money!

Anything else you could suggest I bring? We are allowed 2 duffel bags for luggage.

TIA for your help!