Most of Venice's sewage goes directly into the city's canals. Flush a toilet, and someone crossing a bridge or cruising up a side canal by gondola may notice a small swoosh of water emerging from an opening in a brick wall.
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Venice is very unique in terms of its sewage disposal; the canals are the main way waste is disposed of in Venice, though new technology has improved the sewage aspect of Venice's infrastructure.
You can drink the water in Venice and save yourself the expense and waste of bottled water. Venice's tap water is pumped in from the Italian mainland so you don't have to worry about anything questionable in the water that is floating under the city. That lagoon water is not coming out of the tap.
TOILETS IN VENICEDo not rely on toilet paper being present in the bathroom (here's where your map would be most useful). Be prepared to search for the method of flushing the toilet. There are as many ways to flush toilets in Venice as there are gondolas.
Venice's lagoon is infamous for its dreaded mosquitoes, zanzare. If you're prone to bites and visiting in summer take some insect repellent or a repelling device with you, or buy them in a local supermarket.