(SORRY that some certain people still haven't responded after more than a week! I can't help that! And besides, I've been making a freaking computer! GOSH!)
The sea witch clears its throat and gestures for everyone to turn back around. "When I asked if you needed anything, I was offering to provide it for you... fine folk. It's to better help you complete what I ask of you, of course. As far as food goes, we have plenty around in the kitchens and it will be provided before you leave. Some feasting, and the rest as rations.
"Now, for armor, I don't believe I can help to provide custom-fitting equipment. I do have some enchanted items that are just lying around, though." They turn around and move to a further back cabinet, retrieving some more items that float around in the water after they've been set out. One appears to be just a small plastic bracelet, but it's the one the witch grabs first. "This one allows you to blend in with the water, which your mount might like for sneaking in. In magi-science terms, it makes your membranes thinner and the fluids will course through you better. It's adjustable, in case you become some tiny worm or something... though it'll look more like a strung tie then.
"This other one," they say, swinging a stick tipped with a dull blue gem, "can manipulate the thickness of biological forms and ISOLATED liquids, so it won't work on the ocean entirely. You can slow down an enemy by subtly thickening them up, like a weak petrification."
The last item out there spins around on its own, like a malfunctioning compass or a yo-yo stuck in a whirlpool. "I never did quite manage to figure out how this one works. That leads me to believe it's sort of like a mind-fryer. If you look at it too long, your thoughts dull down and you lose plenty of your thought processes." The witch shudders and pushes it away with a finny hand. "Take it, please. Just don't look at it too much."
An awkward moment of silence ensues as the witch glances up to their turban, looking like they're considering giving it up, then shakes their head. You might be able to convince them to part with it.
"The food will be provided downstairs; I've already let them know. The gold will come from the treasury, meaning we'll bring it to you after you're finished eating. Now, uh, go ahead and conquer, or whatever you do. I hope you come back with even more interesting forms and items."