Never give aspirin or alcohol that is not medicinal in nature to young children (unless in cough syrup for children as it is all measured), especially if they are drowsy, tired, etc.
Otherwise some good and sensible suggestions here. You can give liquid paracetamol, that will help the inflammation, pain & fever which you can get from any chemist/pharmacy over the counter. Don't give Ibuprofen or any anti-coagulant to children such as aspirin; it can cause bleeding disorders.
Can give very DILUTED lemon drinks - it it's too acidic can make them cough, & they won't drink or hot drinks always help with added Ribena & honey, use a cup/bottle with funny figures on it or in a funny shape, & drink some yourself so they know it helps mum too. Lots of liquids is essential to prevent dehydration. Give nutritious soup if unable to eat anything else. Keep him/her sitting up to help with breathing, a little vicks for kids on the chest is always good, keep him/her warm & covered (even if it is a warm day, as kids lose body heat very quickly especially when sick). Take temperature at home if possible or get a thermometer. If his/her condition deteriorates, temp goes up, they get very cold even though sweating, have difficulty breathing, have a constant, wracking cough, etc, please take to your nearest ED/ER or call an ambulance if necessary. This may sound drastic, but if their airway becomes inflamed they can't breathe well, and kids don't have the same compensatory breathing mechanisms adults do, plus they don't understand why they can't breathe and can become very distressed.