When it came to plumbing water in the van, you should do thorough research when designing your system. This might be a job more for a professional but I will try to list everything I have done in my van here.
Here is a list of all the items I have purchased that I will be installing in the van;
• Water tank.
• 12mm Red & Blue water hose.
• Inline Water Filter
• Water pump & expansion tank.
• LPG water heater.
• Sink tap & shower mixer.
• All the fitting + wiring & fuse box