Make and pour a cup of tea without use of your eyes
Gas hob, water, matches
Attempt to fill a saucepan with water, light a match and put it on a hob, all while blindfolded. Don't actually use gas hobs, just get the kids to light a match and place near hob. This will need proper supervision to make sure they blow the match out/drop it before it get close to burning them!
After pretending to light the hob, they need to fill a cup to an appropriate level without touching the water (as it would be hot).