If grid goes down, pull the pump because it is useless. Get some 3" and make a few well buckets. Get a good greaseable pulley, not a flea market special, but a good oilfield type. Set you up a place to fasten it above well. Get you a few 300' ropes NOW. Local stores usually have 50' of big rope. So you need to order some. Your well buckets, get some 3" and put a bell reducer and be able to screw a check valve, spring loaded type, on bottom of this bucket you done made. Secret is, take the spring out of the check valve. Then, just the weight of the bucket will displace the seated ball and allow bucket to fill. Oh top of bucket, cut a collar in half and glue it onto pipe. Bail for bucket then can be bolted across pipe, just under collar you glued on. That way your bolt heads won't be scraping things. Me, I'd make a few buckets, buy a few ropes, few pulleys. All the things you have to do if the grid does go down, none of it happens without water. That's just how it is. I would stock up on instant coffee too. I heat water and put in thermal bottles so I have hot coffee before first light.