Sometimes, that's what you've got to work with when it comes to sound design.
You're starting from scratch, and it's got to sound good.
So what do you do?
Well, take a little inspiration from this advert cut by Thomas Grove Carter of Trim Editing in his favourite NLE; Final Cut Pro*, wherein all the sound design was conjured up from nothing.
*Got to love those audio roles.
I'm assuming that his edit then went to a sound design team for final polishing, mixing, tweaking etc.
I say this because the sound of the puddle splash at 1:19 in Thomas' Twitter Timeline Tour sounds quite different to in the actual ad.
Plus, also, you know, it's standard practice for a sound designer to usually be involved.
But, what you can take away from the Timeline Tour is that it's all very possible, especially with a ton of hard work and creativity.
One especially nice touch is the music start/stop to draw attention to the puddle.