These are just a few items that need to be taken into consideration before a true estimate can be given. However, homewyse.com states the cost of adding a screened in porch in 2013 runs about $4.74-$6.83 per square foot, a cost that takes into consideration the average price of materials and hourly labor wages.
Instead you should be drinking water and herbal teas such as nettle, peppermint or ginger tea which will all soothe an upset stomach, naturally. Keep some raw ginger or tea bags in the back of the cupboard as a stand-by natural remedy for stomach flu in case of emergences or surprise viruses.
Slice uncrystallized ginger and add to hot tea for a warm, soothing drink. It can also be minced and added to stir fry sauces for a chewy, spicy bite. Try adding minced pieces of ginger to cookie or muffin batter as well. Incorporating uncrystallized ginger into your diet in these ways can help decrease stomach upset while adding delicious flavor.