Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: Once the water is heated by the sun, how long will the water stay hot? Will the water still be warm/hot several hours after the sun goes down?
Document: We go to a camp that has no running water and this worked great to wash up and store water for dishes. Fill with water place in the hot sun for several hours and you have warm water. Not hot water but it was luke warm, hang it up and shower. I will be keeping this with the rest of our survival gear, it would be great to have in case of a national disaster. It doesn't hurt to be prepared.
Also, because it was folded so much, the tube has a lot of kinks in it.As for it working, yes. Fill it up and put it in the sun a few hours and you will get warm water. It wasn't really hot, but it wasn't cold.
I used this camp shower on a recent week-long trip to the Caribbean. The place I camped at didn't have hot water. The shower performed exactly as described. It's well made (in China, as I recall) and seems durable. Two suggestions I would make for anyone using this product: first, be sure to place it in full sun for at least a couple of hours to get truly hot water.
Worked great in the sun. Heated up in 1 hour to a nice temperature and was too hot after 2 and 1/2 hours. The hose could be better made. Last one I had came off at the bag. This one I used gorilla glue to help ensure it did not come off. Also it was hard to cut off the water completely with the clamp valve. Would have been better to have a more convenient cutoff at the hose end where the spray nozzle is located. Great price though.
I have a Summer cabin on a lake where there is no electricity or running water. I don't mind taking my bath in the lake but my wife wanted a warmer option. One fill of this bag lasted her 4 showers. She said it was always warm (except for the day I forgot to put it back out in the sun) and one day said it might have been too hot. I laid it flat on a lawn chair in the sun for 3-4 hours and it was really warm.
Many others buy this for camping. Me? I bought for emergencies. There is nothing like having to deal with zombies (or any other emergency) and knowing you stink too.So while I use one for camping, I bought several just to put aside for my prep storage supply.It is easy to use and very little direction is needed. You simply fill it up with water at the top hole and hang it up to warm up in the sun.
I bought this to put in my pontoon bought to shower after swimming in the ocean. For what it is, it works good. I don't think you can beat it for the price. The water gets warm (hot if left out too long). You can give yourself a rinse no problem
Used this at the burn last year. Easy to fill and use. Water was VERY warm after sitting in the sun during the daytime for a few hours.
I expected something more water-tight than the clicking clip system used to kink the hose above the nosel - it drips quite a bit so we had to secure the hose above the bag when not using it or while carrying it - other than that the shower gets super hot in the sun - we put it on the hood of our car in full sun and it was almost too hot. Holds enough water for several short showers.
The biggest problem I've had with this solar shower is that if you leave it in the sun too long it can get scalding hot. I solve that problem by leaving some space to add cold water. It seems durable and a hot shower feels great after working clearing brush all day on some remote land. Make sure to hang it high so you get adequate gravity pressure to wash your head.
Answer: yes