I think a pet sitter would be best. The next best thing would be to keep both cats in different rooms with the doors closed. That way if one cat escapes they still can’t get in a fight with each other (cats are great at escaping.)
I will add that my boy travels to my mom’s house every weekend BUT he grew up there, knows & likes his litter mates, he gets along with the other two cats. We make a point that they see each other every week (or 2 weeks max) so they don’t forget each other. Plus we do a LOT to accommodate him: we feed the same brand of dry food at both places. I bring his cat bed with him and blanket. I take a couple of toys with him. When he stayed at my mom’s house I brought one of his litter boxes (with the scooped litter from home) so he would have more of his territory. I also left him a worn t shirt in a ziplock bag in case he missed me. He still was a little stressed for a couple of days but his cat family helped him & again it is his second home. My boy is white & grey, his brother black & his sister is in the tree. Even after Jackie moved out last Jan, he still is part of the kitty family.
I will add that my boy travels to my mom’s house every weekend BUT he grew up there, knows & likes his litter mates, he gets along with the other two cats. We make a point that they see each other every week (or 2 weeks max) so they don’t forget each other. Plus we do a LOT to accommodate him: we feed the same brand of dry food at both places. I bring his cat bed with him and blanket. I take a couple of toys with him. When he stayed at my mom’s house I brought one of his litter boxes (with the scooped litter from home) so he would have more of his territory. I also left him a worn t shirt in a ziplock bag in case he missed me. He still was a little stressed for a couple of days but his cat family helped him & again it is his second home. My boy is white & grey, his brother black & his sister is in the tree. Even after Jackie moved out last Jan, he still is part of the kitty family.