I personally use covixyl. It's kind of a catchall, everything but the kitchen sink, spray that uses a lot of the virus and bacteria prevention stuff that's out there. It's primary preventative is Ethyl Lauroyl Arginate, but it also uses povidone (which the fda kinda frowns upon in other sprays that call themselves nasal sterilizers), Xylitol (sugar alcohols), and citric acid.
I also keep a bottle of XLear (Which is Xylitol based) on hand, but it's more like a nasal wash than a spray, but it's also supposed to give considerable prevention effects.
THose are the two I use.
There's also BETADINE Cold Defence Nasal Spray which is primarily Iota-Carrageenan based, but some people do have Carrageenan allergies.
Those are the big three I'm familiar with. Clean Air Club on insta has a post with a couple more.
Keep an eye on active ingredients for anything your kids might be allergic to. And if you want to have it administered at the day care and be taken seriously without the covid stigma you could just pass them off as allergy medicine.
