Those plastic totes that are food grade will work very well for the price. You could put 2 of them on a trailer and that will give you 600 gallons more or less of water. You could put one in your truck and gravity flow to fill the other one also with 2 of them. 12 volt bilge pump on batter can supply your water into cabin.
plastic totes are all not "Food Grade"
Food grade is more of a certification of some of the products that can be stored in a tote or any container for that matter.
I would be suspect of a used tote.
you need to be VERY careful
if you use one of these for drinking water.
lots of people are selling these things and they have no idea what has been stored in it.
things like lube oil, Diesel Exhaust Fluid and other chemicals can leech into the poly.
If you use a plastic tote, you can buy a brand new one for a little more.
Check with the company you buy it from.
Myself, I would buy a new poly tank from Tractor Supply. You can get them in smaller sizes like 200 or 300 gallons. Get a dark one to prevent algae from growing in your water
also remember water weighs over 8 lbs per gallon so a 300 gallon tank is going to weigh 2500 pounds