The Slogans

 Don't flush away our future...(UK)

Don't let the water run in the sink, my life would be on the brink... (PL)

Many a little makes a muckle... (TR)

Every second counts to save our planet... (ES) 

Every drop you waste... (HU)

Water always brings prosperity and new life... (IT)

We aren't the first, we aren't the last! Do something usefull to save us! (CZ)