For immediately go to the supermarket and buy a couple of gallons of whole milk. If you have a rubber glove fill it with the milk, cut a hole (X) in the end of one finger and let the calf suckle.
Tomorrow morning go to the local feedstore and buy a 50-lb bag of milk (NOT SOYBEAN) based medicated milk replacer and a calf milk bottle. Feed at the rate suggested on the bag for weight. Be careful to not overfeed. With the stool (solid or runny): brown is fine, yellow indicates overfeeding, white means to call your vet ASAP as that calf if fixing to die on you.
Some, like me, like to include two raw eggs in the bottle. Extra protein plus it is suppose to help firm up stool.
Check to see if the feedstore sells tube feeders. Essentially a plastic bag with a tube and knob on the end. You may have to tube feed the calf a time or two as it was on the cow for longer than normal for a bottle calf. To use hold calf's neck between your thighs. Insert tube trying to keep it to the top of the mouth and throat. May take a couple of tries to get it down. If the calf sucks on it, you are fine. However, putting it into the lungs means death within a couple of minutes. Been there, done that trying to force feed a bottle.
If the calf isn't bawling when it hears you coming with the bottle after about three days it is going to die on you.
If it is sucking aggressively after a couple of bottle feedings then get back to us for further suggestions on water and calf grower suggestions.