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Basic Barry's Batam Bambi Bucket

A small (2500 unit) capacity modular helicopter firefighting bucket (AKA a "bambi bucket"). It's not going to put out an entire forest fire in one pass, but it's very simple to use and most helicopters should be able to lift it and operate it with little to no modification, as long as they have a modern (C update 1.0) winch/connector system

Extremely Basic and Easy To Use Useage Guide:

Spawn in the bucket as a sub assembly (using the dotted square icon second from right in the editor).

Put it somewhere where's there's space, and press "Paste"

Delete your helicopter's winch anchor, but leave the winch itself intact.

Use the Logic -> Rope tool to link the top of the bucket with the winch system.

That's it. You're done!

It will automatically take water when dunked into the sea and will release it when you press whatever button toggles the connected winch item. If your winch has a connect/disconnect button, or a light or anything like that, that's what you want to press.

Easy.
(If for some reason, it wasn't easy, put your questions in comments. I'll try to help, but I'm no stormworks expert, I'm just a person who wanted a firefighting bucket.)