'To shower' in Spanish is 'duchar.'
porque no necesito ducha
You say it "Estoy a punto de tomar una ducha."
"Ducharse" means "to shower (oneself)" in Spanish
"Do not use the bathtub or the shower" in Spanish is "No use la Tina o la ducha". It is pronounced "No OOH-say la TEE-na oh la DO-cha". Please see the Related link below for confirmation of the translation.
Quiero tomar una ducha
You could say "Entonces tomo una ducha" or "entonces ducharme".
Ducha.
Ducha Baño chubasco (shower of rain)
Not really:You could say "I will have a shower", if you are planning to have one; or you could say "I have had a shower" after you have finished. I f you are in the process of showering you would say "I am showering".
Shower.
"Adios por ahora porque me voy a dar una ducha"
nececitas bañarte = you need to bathe