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Yes, you can work this in now. It actually helps with mellowing the fertilizer in the soil, which means that it is less likely to burn plant roots when you plant there next year.

Mixed into the soil or added to compost piles, tea can actually help add both texture and acidity to the soil. So the answer to your question is yes.

I would hold off until spring for fertilizing your plants. Right now they are getting ready for winter dormancy and fertilizing will only promote new growth, which would provie detrimental for the plants.

I would recommend adding a fertilizer now so that it can mellow into the soil. I personally would use compost or manure, but you can also use a balanced fertilizer like 10-10-10 or 20-20-20.

This article will help you: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/blood-meal-fertilizer.htm

Aluminum sulphate is often used to adjust pH levels in soil. Of course, you can also use other this to adjust soil pH as these articles will explain: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/raise-acid-level-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/lower-acid-soil.htm

As for a list of generic names, this would be far too long. There are many things you can put in the garden for a myriad of reasons. Perhaps, if you narrowed this down to something more specific (i.e. fertilizers, pesticides, etc.), we could be of more help to you.