Alright, so you want a "On a budget" contest? Hows this for low budget:
Step 1: Open Your Drink
If you get stuck at this step...... you might need to stay away from any sharp metal...... or liquids.....
Step 2: Drink Your Drink
Again if this step is to difficult, stay away from liquids.....
Step 3: Cutting
Now finally, some real "work"! Take can opener and put it on the can so the blade is on the inside of the top, keep twisting until the top falls into the can!
Step 4: Finishing Up
The last things to do is to take the top out of the can, throw it away and rince out the can.
Now its ready for use! To summarise, this project costs about 0$ if you dont count the liquid inside. (except if your country implements (closest translation is deposits) on soda / beer cans)
To make the on a budget experience complete this ible took about half a hour to write so calculated to minimum wage it only cost about 4€!