1 each slotted handle and a dozen colored disposable tongue depressor tags to get you started.
Have guests bringing kegs of beer to your event. Tag and label the tap with the brightly colored disposable tongue depressor. Switching the style and brewer on the faucet is easy… just replace or turn it around and sharpie the new information on it.
You can also put any number of other Tags/markers in the slot… beer coasters etc.
Your local craft store should have bundles of replacement tongue depressors (colored or not). They are very inexpensive.