Put carrots and potatoes into the pot. Pour the water over it (do not put too much water - it just needs to cover the potato and carrot).
Season it with salt.
Place the pot to medium heat and let it boil, and then simmer it until the vegetables are cooked and soft enough to be easily pierced with the fork.
Use an immersion blender to puree the soup smooth. Add a bit of water if the soup is too thick. Add salt if necessary and freshly cracked black pepper.
Serve it hot with crackers (crackers are optional).