Package Design?

I would like to know what the best CAD software program to use for basic packaging design work. This would be used in a consumer products company for mainly carton and shipper design. The easier to use the better.

How much electric power is needed to heat a liter of water?

I intend to heat some quantity of water (say 1 liter) by applying electrical energy to a resistance. How much power is needed. From the power, I will deduce what electrical resistance is neccessary for using say a 120 V electrical network outlet.

How many nuclear power plants would need to be in the US to be the main source of electricity?

France gets almost 80% of its electricity from nuclear power plants but it is a small country, so how many power plants would the US need to get around 80-90% of its electricity from nuclear power.