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If your tank is currently empty, why not fill a gallon jug from your water sourse and time it. Then fill your fresh tank from the same source and same flow and time that as well. It may not be exact but it should get you close.
You can buy inexpensive water meters that attach to a garden hose. I have one I use occasionally. I have a well and I really don't know my consumption. Thought about putting a permanent one in the line.
I have used my hose to fill my pool and put the meter on my pool hose to measure it.
This would be perfect for your application. I validated my tank capacity with it.
You can google "water meter" to get a source. Have had mine for about 20 yrs. Can't recall where it was purchased. My son gave it to me.
Good luck but there must be someone out there that can send you an e-copy of a manual also.