Are you tired of spilling your drinks but dont want to buy or can't find a cup holder then then use just 2 things a drink (can or cup) and a pair of binoculars.
Step 1: What Kind
You need a drink in a can or cup like plastic but not glass cups because they won't fit and they will break/slip out and then break.
Step 2: Binoculars
You can use any kind of binoculars like the ones in the picture.
Step 3: Finish
Now just open your binoculars and put your drink inbetween the binoculars then close them and then you have a cup holder.