This is NOT a GHB. Rather a everyday carry bag. I have several day packs and want to build a bag for incidentals. I'm thinking a few water bottles, small first aid kit, and some snacks. I have kids and usually my bulldog with me. I think a collapse able water bowl. Snacks, protein bars, nuts, jerky. Of course some wet wipes.
This will go with me to ball games, mall outings, school events etc.
Can you think of any good ideas to add to the bag?

Multi tool (may not be allowed at school events)
Disposable ponchos
Emergency cash
Sunblock
Bug spray
Gallon Ziploc bags for trash and such.

Those are great ideas.

I use a lightweight, cordura type frisbee that doubles as a waterbowl for the dog..it mostly stays in the car though versus a bag

Those are all great ideas, I added my own opinion on a couple of them. I'd also add a few bandaids and neosporin (sp) and a compass if you do any hiking.