What we use here in NZ on farms and so forth is a piping product we called Alkathene. It's actually a polythene based LDPE piping and you can get matching fittings for it. I'm sure you'll be able to find it where you are but it may be named something different. This stuff is much tougher than the garden watering system type piping you get. It can take a strong mains pressure and not leak. It's easy to work with, easy to cut and flexible.
It looks like this:
And you can get a range of fittings like right angles or Reducing elbows with which you can screw a normal tap fitting into etc. Some of the fittings don't require any plumbing tape.
I used some to extend my house hose tap from the wall to a place more useful in the garden. I did that by removing the old tap and permanently fitting the alkathene to it using the appropriate fittings. A few times I've had the water freeze in the pipes due to heavy frost but there was no leak or burst pipe issues. Part of it is buried and part is also out in the open under the harsh NZ sun. So I think it would work well for you. Use U clamps to anchor it against a wall or concrete patio or whatever and route it where you want it to go.
I guess you're wondering, why it's not used indoors? Well, I'm not really sure. It might be because it's less rigid and perhaps not tested for the indoor environment. Farmers have been using this stuff here since the 1980's. I can also tell you the run to my hose tap has never leaked in the 8 or so years I've had it installed (except when I ran over the exposed bit with the lawn mower by accident!). Anyway, do check it out as a possible option over regular PVC.