thats a different matter if they are watery, put some garlic in ur water, and miss feeding for a day, make sure the birds have water, if its only a few birds try and isolate them from others,
i would seperate it from ur other birds, and would not give it worming tablets until u fix othe ailment, have u changed ur feeding etc, make sure it gets water feeding would not matter for a couple of days,
what baking soda and vinegar is good for is putting in ur batter for fish suppers, lovely and crispy/ yes get an empty camera film box put baking soda and vinegar in it just a little put the top on and it will fly off