On Hard mode, patch 1.0.4, when you rescue 2 people (Caroline and Ashley), you consume 4 food and 1 water per day. The Walkthrough says the minimum consumption is 3-4 rescued and it should be 3 food, 2 water. I'm assuming that the 3-4 rescued does not include Leslie and Rachel. Initially I thought that you don't consume any food and water because nothing was written about what happens if you have rescued 0-2 survivors.
(Bug?) I don't know if it's bugged, but you can't collect water from the Water basin (basic) on the day it's raining, nor can you collect on the day after it rained. Even if it rained 2 days in a row, you can't collect water from it.
(Bug?) The salvage zones don't let you salvage on day 2 (you can salvage on day 3, not sure about day 4). I'm not sure if you are intended to only salvage every other day or if it's a bug. But if you can only salvage every other day, the game does NOT tell you that, nor does the walkthrough mention that.
(Bug?) You can't ever ask Caroline to heal you at home, even though she tells you to talk to her when you're injured so that she can heal you.