I dont think i saw any TP in VN. Everything was bidet and wash hands.
wasnt terrible. Cold showers constantly and no water pressure were by far more of a culture shock to me. It was more similar to when I would go and hike for weeks on end in college.
From what i saw they seemed to be pressure/heat tanks (they were mostly silver or dark and in full sun).
Looked like most places had their own personal water tower.