I'd be cautious about using anything other than an NSF 61 certified pump, hoses or containers. If you cook and wash dishes with the water, it really should be potable water. Using a backup RV pump seems to me to be the best option for transferring water.
2011 Rockwood Signature Ultra Lite 8293SS, 12K Equal-i-zer
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed, 3.73
2010 Rockwood Roo 23SS (2012 - 2014)
2009 Ford F-150 XLT SuperCrew, 5.4L, 4x4, 5'6" bed (2012 - 2016)