aves acuaticas (accent on middle 'a' in second word)
pajaros
You can say "pájaros enojados".
You can say "Es para los pájaros".
Las alas del pájaro.
That cartoon character is called Piolín in Spanish. In Spanish, birds don't say "tweet" - they say "pío pío" and the suffix -lín is added to stuff to mean that it is small and cute.
agua
The way you say "Do you need water?" is "Necisita agua?"The c is pronounced as an s and the second i is pronounced as if to say eel.
You can say "un filtro de agua".
agua pronounced agwa
Agua con gas.
'agua' (pronounced AHgwah)
To drink water = beber el agua