Safen -> Gloomy Forest Club -> Beach -> Shiptown glory hole when the number above the door is 4. That's it for now.

I think you can find the drops in the walkthrough

You can manually change the Adventurer's name by altering the save file. First you need to convert the .rpgsave file you wanna edit to a .txt, to do so you can use this website https://www.save-editor.com/tools/rpg_tkool_mv.html But I highly recommend you use an adblocker before you click that link.
Once the file is a regular text-file, you can open it and use the search function (Ctrl+F for most text programs) and look for the line

"_name":"Adventurer".

and change the Adventurer to whatever name you prefer. (I'm assuming you're using one of the prepackaged save files where the MC is simply called "Adventurer", otherwise you gotta look for the name the bunny has in the current save file.)

Then use the link again, but this time convert the .txt file into an .rpgsave file, and replace the old one in the game's save folder with the new one.

The walkthrough should guide you well.

In the beach cave, in one of the caverns in the first area.

You can buy empty bottles from Bobita in Safen, or Bob in Shiptown.

I recommend checking out the walkthrough.

Just go on top of the save with your arrow keys and save on top of it.

1. At the beach where you can dive
2. In the area with the broken bridge puzzle, next to the pedestal with Wulfrick’s toy.
3. Down in the basement of the base.

Weapon Smith is in the Rat Dungeon in Gloomy Forest and the 2nhd note piece in the beach cave. Check out the Walkthrough to see how to get there.