I too was suffering this today, (this morning) but now thankfully flavour is restored (Sicilian lemon, pina colada, and hazelnut coffee).
Here is what i did after scouring the web for suggestions:
Blew my nose, and gave it a good cleaning with a tissue.
Swished a small amount of lemon squash straight (the stuff you normally dilute with water).
Drank about 2 pints of water.
Ate a 1/4 tea spoon of salt.
Smelt Cypriot Coffee grounds, with about very 10 deep inhales (similar to Greek/Turkish coffee).
Made a cup of Cypriot Coffee, swirled some on the grounds sediment at the end around my mouth for about 10 seconds, not very nice but not the worst thing in the world.
Then had another 2 pints of water.
Not sure which of the above worked however the taste is back

and oddly my nose is dripping like it did when i first started vaping, must be a dehydration thing.
Also if you are drinking water make sure the water is quality water and not filtered as you could be low on electrolytes, filtering water removes all minerals, de mineraled water is not very good for hydration. Although your body is full of fluid it is still dehydrated as the fluids are too thin and you are dehydrated. Where i live it get very hot and dehydration is a daily thing here during July-August. to boost salt levels eat good quality salted potatoes, crisps, Feta Cheese or drink bullion, OXO cubes in water, or Marmite in water. or get an isotonic drink