I would be highly motivated to have some water on hand.

Slip three or four half-liter bottles of water into my flight jacket. Bare minimum would be two.

Yes, that is two pounds but you get two small canteens, hard to carry or chemically treat water if you don't have containers, and the disposable plastic bottles are both free and much better than plastic bags.

Using a filter straw doesn't mean you don't need to carry water. In a survival situation having to start by worrying about water because you have none is a terrible way to start. A liter, ideally two, of water on-hand and ready to go gives you something to work with and something to tide you over during the first difficult hours when you are rattled by the situation and getting your footing.