can someone help with this evil prefix puzzle?

[horrible]

i'm breaking my balls trying to figure it out...and the insomnia is kinda making me more half-wited than usual :(


"find a word which can prefix each of these words to make a new word?

colour
cress
fall
proof
shed
way"

[Lancet Jades]

Umm....thats easy >.>

"Water"

[horrible]

O.O

*gives lancet a big hug* my hero :D