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.
People have been using ginger to help digestion and treat stomach upset, nausea, and diarrhea for thousands of years, as well as for treating arthritis. Ginger is still used for these purposes today, particularly for preventing and treating nausea related to pregnancy, motion sickness and chemotherapy.