Lisa we invested in a five-day cooler years ago. Took it camping and it does work. We stack a few bags of ice in it and they lasted 5 days. Most flooding I have seen in TX is Houston-area, La Grange area is low-lying and anywhere by the rivers.
We are keeping an eye on Harvey because they said it will stall and may head back out into the gulf. Don't want it wobbling this aways. We live in an evacuation zone. If it's a hurricane, we leave. We can weather a storm. I have enough candles to last me to the next century, lol. Also got a coleman propane stove, fuel, matches, batteries, water stored. I used to have a 55 gal plastic drums that filled with rain water. That would fill and be useful for filling the toilets. Got to get some for here.