  Large-scale outflows are believed to be an important mechanism in the
evolution of galaxies. We can determine the impact of these outflows by
studying either current galaxy outflows and their effect in the galaxy or by
studying the effect of past outflows on the gas surrounding the galaxy. In this
work, we examine the CO(7-6), [CI]\,($^{3} \rm P_{1} \rightarrow {\rm ^3
P}_{0}$), H$_2$O 2$_{11}$--2$_{02}$ and dust continuum emission of 15 extremely
red quasars (ERQs) at z$\sim$2.3 using ALMA. By investigating the radial
surface brightness profiles of both the individual sources and the stacked
emission, we detect extended cold gas and dust emission on scales of $\sim$14
kpc in CO(7-6), [CI](2-1), and dust continuum. This is the first time that the
presence of a large amount of molecular gas was detected on large,
circum-galactic medium scales around quasar host galaxies using [CI] extended
emission. We estimate the dust and molecular gas mass of these halos to be
10$^{7.6}$ and 10$^{10.6}$ M$_\odot$, indicating significant dust and molecular
gas reservoirs around these extreme quasars. By estimating the timescale at
which this gas can reach these distances by molecular gas outflows (7-32 Myr),
we conclude that these halos are a relic of past AGN or starburst activity,
rather than an effect of the current episode of extreme quasar activity.
