Hope you haven't put processed sugar in your water?!? I dunno what it'll do other than draw ants, but you can do it. If you wanna use something sweet (pun intended) on your plants, botanicare (pure blend pro maker) makes a sugar based additive called "Sweet". This will be available to your plants, white sugar will not. Also, you can use--with great success--an unprocessed (raw) sugar called "Sucanat". That stands for Sugar (Su) Cane (ca) Natural (nat). Any of those "Buffy, bring the Beemer" foo--foo organic veggie stores will stock it. Rich people get off on unprocessed shite, makes 'em feel dirty. At any rate, Sucanat will make the plant taste simply excellent, not sugary but more of what it already has. Good Luck mate.

porgy