if it's a series one t3, then it'll only have an oil feed hole and an oil return pipe.
if it is a series two turbo, then it'll have the same as above, but with two big threaded holes in either side 90 degrees from oil connectors which banjo fittings connect to for the water.
you can run the sreies two water cooled turbo without the water connected, however after a hard run, you'll need to allow engine to run for a few minutes to let the turbo cool and not suffer from heat problems.
not connecting water will aid engine cooling.