* agua: water
* peces: fish
* bote: boat
Based on these words, the most likely verb is "pescar" which means "to fish".
Here's how it fits:
* "Agua" (water) is where the fish are.
* "Peces" (fish) are what you are trying to catch.
* "Bote" (boat) is the means of transportation to get to the fish.
Therefore, "pescar" is the verb that would connect these three words.