Cantalope Smoothie

I first had this treat living in Guatemala.  Totally refreshing and cool, for a hot day. 
2 c. cantaloupe chunks - (peeled and seeded).
2 c. ice
Sugar to taste
Water as needed

Place ice in blender, then add cantaloupe.
Cover, and blend until smooth.
Add sugar to taste, and water if consistency is too thick.
Serve immediately.