I have just paid my water bill on line with Mugla Buyuksehir.
It seems we we were charged 1.5 TRY for each cubic metre but there were several other items on the bill; amongst them ATIK Su which I think is waste water even though we are on a septic tank, there was CTV and KDV the latter I know is VAT by any other name, there also minor fines for being late with the payment.
Link used
https://odeme.muski.gov.tr/Then debt link on the right (if you use chrome it automatically translatesthe tabs on the right)
Then tick subscribe with registration no
Then put in the tin label number on your water meter.
Our bill came up and in the midst of a table listing our current bill and the earlier one which we were late in paying was a line about "do you want to hire a four wheel truck". I ignored this I suppose it could be for those wanting to hire a tanker e.g. to fill a pool.
Paying the bill, it kept failing with a Garanti debit card but worked first time with a credit card (UK based CC).
Once paid they provide a PDF for each bill/receipt to print.
A less painful way of doing it than queuing although DD would be even better.