> the water was undrinkable and they couldn't get food
It was just for a single group of people and only during a specific moment:
“the settlers, who first arrived on the island in May 1607, feasted on deer, turtles and sturgeon during their first year in the New World” “confined to their fort, the colonists could no longer hunt, fish or seek fresh water”
Siege conditions happened everywhere, not only in the New World.
That's mostly inaccurate and only true after they had been taught by the Indians how to hunt in the new world. The first year the pilgrims were in America was spent ransacking Indian villages destroyed by the plague for food. It wasn't until a friendly Indian called who renamed himself "the wrath of god" showed them hunting that they stopped starving. Again the death records for the early colony are fascinating reading.