Anacondas are large, thick-bodied snakes that love their water. I give mine enough room in the enclosure for a warm/basking area at 88*F, a cool side at 78-80*F, and a soaking tub in addition to a smaller dish for drinking water. The soaking tub should hold enough water that the snake can submerge itself and with sides high enough that it only needs to be half full so when the snake climbs in it doesn't displace the water into the rest of the enclosure. You will also find your snake poops/pees in the soaking tub regularly so get several, so you can quickly replace a soiled one with a clean one.
The tub size you are planning will work for a few months but I would start looking at upgrades now, as before you know it the tub housing the snake now will become its soaking tub.
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