@flash How are you planning on tackling tuning? How familiar with are you with turboing an engine never intended to be turbocharged? Are you planning to intercool it?
What I've used in the past and will use again, for the oil feed is cold rolled steel brake line tubing, bent with a small bender to provide the perfect shape, then use flared ends on AN fittings to secure. The advantage is that once it's in place, and not leaking, it pretty much never will. It's also tons cheaper than braided hose and tons easier to work with, not to mention the metal won't degrade over time like the rubber/viton in the braided lines eventually will, it'll also survive better near the exhaust flange. For the drain however, I recommend using AN coupled, braided line, since it's down low, the braided will take a hit from dirt/debris better in the long run since it'll deform and return instead of snapping when a rock hits it.
For the water feed, AN coupled braided is the only way to go IMHO.
Rudimentary drawing, much easier to visualize this than type it out.
The flow restrictor in the turbo will preclude starvation in the engine if setup in this manner. The way your manifold is built, the drain line can be done with a 45 degree canted fitting on the oil pan, and a straight fitting out of the turbo. The drain will have a nice "downhill" slope preventing any puddling. The bikes with the turbos back where the ABS goes, under the seat, have to do it slightly differently, they are not a good guide for your particular application.