[Flash..]

Draw a line around the inside of the bucket 4" from the top, when filling up and the water reaches the line turn the tap off.  You could also tie a bit of string to your thumb when filling the bucket to remind you to turn the tap off.

[AuRavelling79]

Move to Scotland - in the winter the water will be solid! No more spills.

[Jonny 87]

Move to Scotland - in the winter the water will be solid! No more spills.

Now that's what I call "thinking outside the bucket" er.......I mean "box".

[Pureandclean]

When using a 5 litre bucket filling up with 4 litres of water should stop you from spilling the water. Find a 1 litre plastic bottle from your re-cycling bin and fill that, transfer water to bucket and then repeat a further 3 times.
Train any apprentices with this system and you should have no further problems. 

[Chris Buchan]

Just spit on windows and rub about a bit,no bucket,

honestly,some people need there hand held.