Substitutions for Ingredients in Crustless Pumpkin Pie?

With regard to the Crustless Pumpkin Pie: If I don't have the Spenda or Equal can I add more sugar to it or just leave it with the 1/4 cup of regular sugar? Also can I use regular skimmed milk instead of canned? And the egg substitute can I use just the yolk of the egg?

By Linda Delcamp from Brighton, MI