My English textbook says that “very much” or “very many” is not used as a quantifier. (I know than “very much” is used as an adverb.) What do you use to increase “much” or “many”? In these examples I’d like to say that there is not just much/ many something but “much-much” / “many-many”. What can I use instead of “very much” and “very many” in the follow sentences?

1. I’ve got very many questions.

2. There are very many tourists in the town in summer.

2. He drinks very much beer.

3. She spends very much money for clothes.

3. There is very much sugar in the jam.

Thank you in advance.
'A lot of' can be used. I think the first (with many) 2 are fine.

Regarding 'much', there is often a problem for ESL learners: much cannot be used in a positive statement, but can be used in a negative or in a question. ie "He has much money." is wrong. However, any native speaker will understand the statement. 'A lot of' has no limitation, so one trick is to always use that choice.
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1 and 2 sound a bit odd to me. I think I would just repeat 'many'.
I know that in a positive statements “a lot of” is used. But I’ve got to say “more than a lot”. Maybe “a great many” will do?

And one more question. Can “too much” or “too many” be used in my examples?
Alex+ Can “too much” or “too many” be used in my examples?
Yes. No problem.

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He has much more money than me or he is much more interested in partying than studying are both positive statements. There are exceptions.