Now, to the 'made with' consideration: 'Made with' implies that there are more than one important elements. 'Made with' is usually used when referencing ingredients, of which something like lemonade requires to become lemonade. Examples for 'made with:' "The bagel is high in fiber because it is made with whole wheat flour."
"Made of" vs. "Made with" - English Language & Usage Stack Exchange
What is the basic difference between "made of" and "made from." Both expressions are used in English. For instance, "This chair is made of wood," and "Cream is made from milk." Though the question is
'Made of' vs. 'Made from' - English Language & Usage Stack Exchange
The phrase made of is more appropriate when the material that forms the object is not described as consisting of discrete units or amounts, while made up of is more appropriate for a whole composed of several discrete units. The car was made of steel while The car was made up of various steel parts Boards consist of discrete individuals or groups of individuals (or the discrete entities they ...
"made of" vs "made up of" - English Language & Usage Stack Exchange
man-made is wrong here anyway. Man-made is really for things, not states of affairs. Poverty is a phenomenon for which humans are responsible or created by humans.
If you say "is to" it indicates that you made a decision, but have not yet carried it out irreversibly. So in that sense the statement "The only good decision I have made today was to…" sounds slightly awkward (because "have made" sounds less final as a tense, but "was to" sounds final). So I'd go with "The only good decision I made today was ...