I buy 250kg at a time (20/30 anthracite) for 100GBP, delivered and store it in the wheelhouse (for now, in the future they will go in the fore peak), I cut the top of the bag halfway open and pour it into 2 copper buckets just outside the wheelhouse. A 25kg bag lasts about 2 days.
For coal lugging gear I wear normal clothes, the place i buy it from is fantastic, they wipe coal dust off their bags and keep them covered so they stay clean.
I haven't noticed any corrosiveness from anthracite, but one time I got bituminous coal and it turned the inside of the buckets green! My recommendation is to steer far clear of bituminous coal as it's smelly and burns too hot and fast. when burning it the boat smelt like a steamship