[RnMomof7]

Yes, when ever the single, generic term is used it means water baptism. St. Thomas Aquinas defined baptism as; "Baptism is the external ablution of the body" It is the default meaning.

So water is the only way for that to happen?

[Natural Law]

"So water is the only way for that to happen?"

ab·lu·tion

NOUN:

1. A washing or cleansing of the body, especially as part of a religious rite.
2. The liquid so used.