Hello! I want to say 

"Remind me to water the flowers tomorrow", or possibly the somewhat more convoluted

"Remind me that I have to water the flowers tomorrow".

I can sort of piece it together, but I am having problems with the inner clause ("iç cümle").

Could somebody be so kind as to help me? /Fredrik, Stockholm

Yarýn çiçekleri sulamamý (bana) hatýrlat.

Yarýn çiçekleri sulamam gerektiðini (bana) hatýrlat.

They are perfectly legal sentences yet they do not sound natural to my ears.

I (and I guess many other native speakers) would prefer saying something like

Yarýn çiçekleri sulamayý (bana) unutturma.

Yarýn çiçekleri sulamak gerektiðini (bana) unutturma.

As a native speaker I would say either your sentences or my sentences and yet they both sound quite natural to me

You can learn all about everything sentences from that link which bottom. But link is Turkish.

http://www.edebiyatogretmeni.net/cumle_turleri.htm