Take one teabag of a strongly-flavored herbal tea (I prefer Wild Berry Zinger).

Put teabag in a large mug, fill three-quarters of the way with water, and microwave for two minutes.

Let sit for one minute.

Remove teabag, and stir in:

honey

lemon juice

1-2 eyedroppers of liquid echinacea

Both the heat of the tea and the lemon juice will help to break up your congestion.  The echinacea will help your immune system.  The honey will help soothe your sore throat.  And the flavor of the tea and the honey will help to disguise the taste of the echinacea (which is not very pleasant).

Have a mug.  Repeat as necessary.