Just noting that the OP specified "next August."
Most often, sleeping bags rated -10 or -15 (C) are fine for anyone down to around freezing. For me personally, they're generally too hot above freezing, so not suited to summertime or indoors.
I'm not fussy about pillows, but I've learned to always carry a compact, inflatable sleeping pad (formerly known generically as "Thermarest") even when not planning to camp. In parts of Asia the standard mattresses are so thin as to be torturous for my arthritic joints, and I love being able to add my inflatable to whatever's on offer. It packs to about the size of a coffee cup and weighs almost nothing, but does inflate by lung power and make some noise when I toss and turn. It has also come in very handy in airports when flights are cancelled...which they sometimes are.
Whatever you do for gear--this includes toiletry kit, comfort items, camping stuff, etc.--be sure to test it out at home. I've had 50+ years to refine my packing list (and it's still developing), with some notable disasters along the way. Most of these can be avoided by not waiting until times of desperate need or stress before testing.
Hope that's helpful.
Mark
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