If all you are after is temporary
storage until you can get your tank fixed--if it has a reasonably sized
inspection port--insert a bladder.
I prefer to use a rack which has compartments lined with
marine carpet glued to
plywood partitions. Across the front of this rack is a barrier of laminated timber also coated with carpet. You can see where this is going?
Each of these five or six compartments holds a 20 litre polypropylene
water container. They are drained through a plummet hose fitted through their caps, and can be emptied one at a time or all together. They are an excellent system--if one
leaks one does not lose all the
water, and if one needs to fill the
tanks from a coastal stream, each is light enough to be lifted out of the rack and lowered into a
dinghy. In a
Wharram they are the easiest
tanks to fit and are
cheap to set up and maintain. If one makes them to fit those 20 litre detergent bottles such as are used by car-washes--one might get them for free or at a reasonable price.
A rack of 20 litre containers secured under a lift-off lid makes a great
work bench.