For nasal congestion, it is really hard to beat Afrin nasal spray - 0.05% Oxymetazoline and some small amounts of eucalyptus and camphor. Since it is a nasal spray the systemic effects are minimal if used as directed, and it will clear out your nasal congestion and let you breathe free.
Spray it up your nose, wait 15- 30 seconds or so, and feel relief.
DO NOT drink it, it might really harm you, but then, if you try to ride your bicycle backwards, that might hurt you as well. Just follow the directions.
That and half a gram of oral chewable orange flavored Vit C works for me.
Vit C, camphor , eucalyptus and a derivative of ephedrine, all natural agents.
If I have a fever or myalgias, then I add one 220mg tab of Aleve a day - I am not allergic to aspirin or Non-steroidals - folks who are allergic or suffer from stomach ulcers etc obviously shouldn't take drugs they know will affect them adversely, like Aleve. Do not mix Aleve with alcoholic beverages either. Aleve is derived from aspirin in a way, and so I think of it as natural too,
Fresh Squeezed orange juice is great and a good source of Vit C, but it does have a fair bit of sugar too, though.