Maybe a humidifier/vaporiser if there’s an easy way to get one and mould isn’t a problem.

Other than that maybe some eucalyptus oil (bottle or spray) so you can put a little on the shower floor and breathe the vapour in when and if you’re up to a hot shower. (Be careful not to slip or let pets lick the oil.) The moisture thins and loosens the mucous so you can cough it out more easily. Get some Vicks if you’re not up to the shower.

Also easy foods so you can constantly keep eating while resting. Protein bars, Up N Go or premade protein shakes and salami/jerky if you can’t leave bed, tuna tins and soup if you’re more able to get up. Lots of protein. Lots of fluid and tea.

Also if you don’t have anyone to gently thump your back lean over the edge of your bed so gravity can help you cough your airways clear. Plenty of tissues to cough and spit into. Baby wipes and sanny. Bin nearby.

Hot water bottle for the chills and paracetamol for any fevers.

Edit: Also garlic and onion if you can eat them, especially in chicken soup

Source: Used to have frequent horrific bronchitis/chest infections