Only from these resorts: the 3 All-Stars, Pop, & CBR. At CBR, the bus stops only at the Custom House. The bus runs every 30 minutes, but only when something is going on at EWWS.
If you're at one of those resorts, you're in luck. If you're at AoA, you can easily walk to Pop for the bus. It can take up to 25 minutes to get to EWWS, so you should allow 1 hour including wait time.
If you're at another resort, you would need to take transportation to a park, then a bus to one of the above resorts, and then the bus to EWWS. With all the transfers and potential wait times, you should plan on 2 hours travel time.
A taxi ride should cost between $10 and $25, with Pop/AoA being the closest, and the MK resorts the most expensive.