In another thread it's been pointed out that there's an example in Plautus, from Amphitryon, line 1058.
animo malest, aquam velim. corrupta sum atque absumpta sum.
"I'm sick at heart, some water I could wish! I'm overpowered and I'm utterly undone." (Henry Thomas Riley)
Edit: As has also been pointed out in the other thread, even in this example she is not directly asking someone for water, she's just saying she could do with some.
Hoc is the neuter form which is needed as crustulum is a neuter noun. Look at this table for the complete declension of hic.
Note that some of the vowels have a macron over them like this: hīs. The macron indicates vowels that are long. Vowel length is extremely important if you want to learn Latin well although it seems to have been ignored in this course.
At the bottom of the page there is a "Change the order" link. The initial layout of the table is the tradtional case order usually given in the United States; the alternative order Nom, acc, gen, dat, abl is the one usually given in the UK and some other countries. If you want to commit the table to memory (which I hope you do) it might be helpful to do so in the order usually used in your country.
It's like in descend languages, and even, it's like in English.
Ce chien est propre.
This dog is clean.
"Ce" and "This" as demonstrative articles.
"Ce" est un chien -> C'est un chien (proper form).
This is a dog.
"Ce" as an impersonal pronoun. (thus, neutral).
(In French, it only works for "ce" not the declined form though (ces, cet, cette).
Yes, "for this" is also given as a translation here: https://en.wikipedia.org/wiki/Ad_hoc
"In English, it generally signifies a solution designed for a specific problem or task, non-generalizable, and not intended to be able to be adapted to other purposes"
Towards this = toward this goal (for this)