Quaff them all and hope for haste?

Youll need two potions

No

I'd argue it's safer to use the scroll of identify as a scroll of divination or use a stone of intuition if you have one

You can't get them all unless you've got two haste potions, blink stones or ethereal chains.

But yeah, the potion for a puzzle is always on the same floor so if you remember which you got on this one, it's one of them.

Levitation. If you insist on doing it that way, start with the most recent pick up. I've done a lot better at this game ever since I stopped trying to force this situation and instead come back after I know for sure, within reason

You just need a potion of haste and levitation make sure to stand on where you pick up the first key then take the potions you just have enough for all the chest if not you will be stuck on one platform.

You're only on floor 2. I'd do it.

It's not worth it. It's better to turn the levitation into aqua brew