take a serving glass and add 2 tbsp of tang powder in it.
Add cold water & mix well.
Add ice cubes and enjoy.
Notes
In place of orange glucose, you can use plain white glucose also.
Use 1 tsp of white vinegar in case you don't have tatri.
Likewise you can make tang of other flavours also. But in that case use only plain white glucose. Also need to change the food colour and essence depending on which flavour you are preparing.