I understand stocking up on TP. I don't understand stocking up on bottled water. COVID-19 isn't causing wells to run dry or city water systems to shut down. There are some people who legitimately need bottled water because their well water is poor quality, but those people are in the extreme minority and now they're being harmed by people who have perfectly good water sources and don't actually need bottled water.
The hoarders are a whole other story — the ones who've been buying up HUGE quantities of stuff and reselling it at obscene markup. Karma will not be kind to them.