Question about water supply

Hello all.  Well, we finally got someone out to diagnose the slamming
sound we'd been hearing coming from our well pump storage tank, and it
was probably the worst possible scenario... Seems we need a new well
pump.

Well, like most people I know these days, we don't have a spare
$3k-$5k laying around at the moment, so we're trying to come up with
the money somehow.  In the mean time though, I'm trying to work up
some contingency plans, and I have a question (which I'm finally
getting to!)...

Is there any way to hook up some sort of external water tank to the
inlet of the pump storage tank temporarily?  What I'm thinking is that
if the pump dies completely, which we are told is just a matter of
time, if I know I can at least hook up some sort of tank to take the
place os the well on a temporary basis, I at least have a fall-back.

I mean, we can ration our water supply and buy water and fill the tank
on a regular basis.  Very annoying and certainly not a long-term
solution, but since getting the money together doesn't seem likely at
the moment, it's an option I'd at least like to know I have.

Any insight anyone can offer will be very much appreciated!