In the absence of context, this is the most accurate meaning I can translate for you:

I also found some rum in the big cabin, and I drank a large glass.

At the same time, I found some rum in this exquisite hut and drank a large glass.

I really need enough courage to face everything in front of me.

I really need to drink more wine to cheer up for the next thing.

Rum is rum.

Dram means cup, but large is added in front of it, which translates into large cup here.

"Indeed" is used here in a clear and concrete way.

Spirit is a verb here, which means to cheer up and encourage. ...

Finally, for what happened before, because the whole paragraph is in the form of past tense, it is translated here as: for what will happen next.

I hope my answer can help you.