Regardless of the diameter of the water supply line I would highly recommend using a regulator, not the cheapo pressure restrictor, but an adjustable household regulator or at the very least a pressure gauge to verify the supply pressure. Your rv is rated for 60-65 psi, but we have been to several parks that were between 80-100 psi.
As for the water filter, most rv supply stores have a filter with a changeable cartridge that you can connect to your hose, I WOULD NOT use one of those blue hose filters but once then throw it away unless you are using it continuously til used up, don't use it throw in your bucket & use it next week or it will be full of all kinds of YUK.
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