Ah! So that's how so many folk get away with carrying a smaller ruckack, is it?
My tent goes inside my 75L pack, in a heavy-duty black bin bag but it's fairly near the top where I can hook it out without any trouble. Pole bag is down one side and peg bag down the other side, again little fuss to get out. The bin bag doubles as something to kneel on / sit on in the porch.
For water I have a folding 5L plastic water carrier, Chinese. I make sure I pitch near a water supply (stream, lake or pool, no taps where I go) and I fill the carrier up then. A little collapsible funnel, also Chinese, helps me fill it quickly with my mug as a scoop.That's enough for me for drinking, cooking and washing; there's usually a bit left to tip away when I pack up in the morning.
For drinking I clip a Steripen Prefilter on a Nalgene Cantene 1L collapsible water bottle to stop any bits getting in (the standard 'solid' Nalgene bottle is more indestructible but weighs more) and then I sterilise it with a small Steripen.