@ haywire...define a lot of water. Did the water trap light illuminate on the dashboard?
1) does the white smoke occur only on mornings or every time u start? When my bt50 head had cracked the white smoke shake up of engine occurred at every start up and progressively got worse.
2) coolant reservoir needs topping up? I had to add a chubby bottle of water at the beginning which increased to about a litre of water every 2 days until the head cracked out fully 5000kms later.
3) open radiator cover and start up van. Are there bubbles whilst idling. Usually head or gasket.
As bezman indicated do diagnostics on injectors to make sure they not dripping first which can cause shake up when parked up overnight etc. Additionally If injector is shot the engine would knock like a bearing constantly...which you have not indicated as a issue.
The wl heads notorious....if it's ur head you can get complete head by faiz for $5000 approx. what I did after I changed mine was throw out the thermostat , upgraded to 3 core radiator and installed extra fan on ac condenser.
Keep us posted.