I think that Stephie's answer is correct if you are talking about German German (The kind of German that is spoken in Germany). In Austrian German the word »Schorle« is widely unknown. It isn't even listed in the official dictionary for Austrian German (Österreichisches Wörterbuch, ÖWB).
So here is an addendum to Stephies answer, and it deals only with Austrian German:
The german verb »spritzen« can be translated as: squirt, splash, spatter, sprinkle and also inject. So when you put ("inject") soda water into wine, this is also called »spritzen«, so the resulting drink is called ...
Ein gespritzer Wein
The short form of this is
or even shorter
The mayor of Vienna, Michael Häupl, is know for using an alternative Term for this drink:
see: https://www.youtube.com/watch?v=mgfdnAMSGRM In this 3-Second-Video he says: »Man bringe den Spritzwein« (You bring the spritzer)
If you want to be more specific, you can say if you want white wine or (not so common) red wine mixed with soda water:
Ein weißer Spritzer = White wine mixed with water
Ein roter Spritzer = Red wine mixed with water (just a theoretical possibility. I never saw this in real life)
Also well known, but somewhat outdated is ...
eine weiße Mischung
This literally just means »a mixture« or »a white mixture«.
All the above terms refer to a mixture of wine and water.
When you mix a softdrink like coke or some juice with water, then this is:
Ein aufgespritzes Cola = half coke, half water
Ein aufgespritzer Apfelsaft = half apple juice, half water
Ein gespritzer Apfelsaft = the same
Keep in mind, that soft drinks are female in Germany, but neuter in Austria, so in Austria is correct »ein aufgespritzes Cola« or »das aufgespritze Cola« (»eine aufgespritze Cola« would be wrong in Austria, and since I believe that »aufgespritzt« is not used in Germany, it might be wrong there too)
If you mix soft drinks with water, the word »aufgespritzt« is more common than »gespritzt«. If you mix juices with water, »gespritzt« is more common.
But you also might mix wine with some softdrink or juice. This is called:
Ein süßer Spritzer
Eine süße Mischung
or, a more specific example:
Almdudler is a very popular soft drink in Austria. It tastes similar to ginger ale, and is very often used to mix with beer and wine. http://en.wikipedia.org/wiki/Almdudler
Ein Almdudler weiß = Almdudler mixed with white wine
Ein Cola rot = Coke mixed with red wine