Vickie,
I'm so sorry for the loss of your mare. We've recently been through it too and are still grieving. It's been over a couple of months now and Jeffie is 3+ months old.
You've made your first hurdle with your little colt with his accepting a bucket. We had to go through the bottle stage.
I recommend that you also offer him a dish of Foal Lac pellets mixed with Mare&Foal Grain. Our little guy was given this option and after a couple of weeks he was eating from both sources. Initially we were feeding him every 2 hours, but were able to stretch that out gradually.......He told us by how willing he was to eat.
By the time he was about 5 weeks old or so, he was more interested in eating the grain mixture and ignoring the liquid. We also kept a fresh bucket of water available at all times.
Initially, he also needed an enema because of the change in his diet, so be prepared for that.
Please feel free to put us on your PM list if you want to ask any questions. Believe me, we know what you are and will be going through!
Blessings,
MA