direct connect hose
At the hardware store, in the plumbing dept, find the connector that will connect the threads of the faucet to the female end of a 1/2" hose. Then get a female 1/2" hose mender kit, plastic is fine, also consider getting a male end and a hose shutoff valve, but not required. Measure the distance from the tank to the faucet, and add a few feet for slack and moving around furniture. I suggest getting a 20 gallon rope handle bucket to store the whole thing in so it doesn't kink up. I have a double suction cup heater holder that I tied onto the tank end so it stays in the tank when I walk away.
Drain well before storing, and plan on bleaching the whole thing every few months or so if it gets nasty looking inside.
Otherwise you need a pump with a head of about 5 feet. You can do the research to find the pump specs but it is difficult. I got a Via Aqua 1300, about $17 online IIRC, with that in mind but never got the right size hose to use it -- even having the pump meant I had to drag the big bucket of water over to the tank or pump from the bathtub, my back was really starting to hurt with 15 gallons of water in the bucket.
I could ahve used the pump from the bathtub, but I never figured out how to turn it off from across the room... seemed like I'd risk overflowing the tank the pump rate is so high. I actually found a remote control on off switch but by then I had built the long hose for direct connection so I never tried to use the remote with that.
Using the long hose from the sink isn't a problem, I can turn the rate down for the last inch and then it is not a rush to get the level correct even if I am 3 rooms away I can time it correctly. For while I was using a waterbed fill/drain connector but when it broke I started draining out the window.