Water sources are regularly available after the first 2 hours (both lakes and streams), but all need purifying (we brought a Grayel Ultrapress device, and saw others with steripen etc).

Should be possible in the winter as well, but you'd need crampons & hiking axe as the final descent to the lake is quite steep.

No phone signal for almost the entire route, and so if you're hiking outside of tourist season make sure to let someone know where you're going. The route can be navigated by a good 4x4 car so rescue is possible, but you might not see anyone else all day.

Finally this is at high altitude, so the Fatmap times are optimistic. We did it in 5h (with good pacing and 2 stops), but it could easily be 6-7h one way. The West route is about 2-3h down if you choose the circular option.