Place the bread in a small bowl, wet with water and soak for a few minutes.
In a food processor, blend the almonds until as fine as possible. If using almond flour, add to blender.
Squeeze out the water from the bread and add that to the almonds in the food processor as well as the grapes, , optional chile, cucumbers, salt and pepper, and olive oil.
Add water and blend until you have a smooth mixture. You may need a touch more water. Adjust seasoning. If your grapes aren't tart enough add a bit of sherry vinegar.
Place a fine mesh sieve over a bowl and pour soup into sieve. You'll need to press and stir with a spatula to force the mixture through.
Cover the sieved smooth soup and chill in fridge for at least 2 hours. When ready to serve, garnish with grape slices and olive oil.