fresh water tank

we have a 2017 Malvern. The fresh water tank is leaking, we have phoned our local dealer - he is fully booked until March!!!
Is this something that can be fixed by us? Can you buy a new fresh water tank?

Need a lot more information about the leak, ideally with pictures, to give appropriate advice.

If you're talking about the actual tank and you can get at the hole/split could you not drain the tank and make a temporary repair with this product...until your dealer can replace the tank.

https://www.toolstation.com/fiberfix-flexible-patch/p75120?utm_source=googleshopping&utm_medium=feed&utm_campaign=googleshoppingfeed&mkwid=_dt&pcrid=560328663820&pkw=&pmt=&gclid=CjwKCAiAvriMBhAuEiwA8Cs5lYF99zLJpLLoDdOu8TGXjbAQhIx0zczp0Awe6hbhAIl-bOpZHv609RoC3loQAvD_BwE&gclsrc=aw.ds#full-desc