Tile is hard to come by if you're building with materials you find on the land. Fired mud brick comes to mind.
Discussion
Mud brick will still be porous unless first hard-fired then glazed. Finding adequate clay isn't THAT hard around here, but firing at a high enough temperature is.
Hmmm. Gets really hard if you depend on locally made materials.
Firing them isn't too hard. Glazing might be more difficult, but, not impossible.
Yes, but, every place holds the solution to the issues, it seems.