the Futami Ko dock is getting an extension, construction is underway. When we docked here on February 16th 2019 there was already about 50 feet. Once it is completed it will help to shield the dock from W-SW swells. Note that this extension is not yet charted, so if entering at night be careful (the end has two blinking yellow lights).
Water is available at the Futami dock, though access is restricted (the faucet is locked) and so you must ask for the key (An Ogasawara yacht club member who works at Flora helped us). There is a flat fee of 1000Yen for filling up, that is, unless you require a LOT of water.

For trash, you can find out which days to bring them out, or you can carry them to B.I.T.C store to bins next to the vending machines. They have bins for pet bottles, cans and burnable trash.
Internet is available at Heartrock cafe, otherwise you can register for a free FREESPOT account at the visitor’s center (seems unlimited with an account, for 180 days), or you can visit the internet center at the north-west end of town, south of the weather station (300yen per hour, no wifi, power available).