OK, there are many ways to handle waste water depending on how conservative you are and how many people you have. DW & I can go a week on the black tank but we're gone during daytime. If you use cg bathrooms and reserve the TT toilet for night runs you should be able to do the week.
My gray water disposal has evolved from a couple of 5-gallon buckets with pour spouts (free), to a Harbor Freight 12V pump and $10 30-gallon barrel, and now a macerator pump into the 30g barrel fitted with a 1-1/2" dump hose.
The macerator uses 3/4" pond tubing since it's light and flexible. The 1-1/2" is sump pump discharge hose (cheap) controlled by a RV gate valve. The bonus is that I can now stay 2 weeks in a no-hookup cg and dump my gray and black tanks and also dump & flush my tanks at home. The 3" RV hose still gets used at FHU cg's.