As I remember from 2015 (I took Tamallancos route out of Ourense):
OURENSE - CEA:
- there was a bar approx.6km from muni albergue in Cudeiro when you cross OU-150,
- supposed to be 2 bars in Tamallancos (KM 15) but haven't seen any, although I've seen signs for one, when crossing the N-525 you should turn right,
- I stopped at bar/estanco in Bouzas (KM 17),
- bar/restaurante A Carballiza in Viduedo (KM 23), last house in the village, on right side of N-525, supposedly tienda there too,
- all infrastructure in Cea.
CEA - CASTRO DOZON:
- two bars in Oseira (KM 11),
- bar at Gouxa (KM 18) was closed, I couldn't ask anyone if permanently because the village was deserted in the midday heat,
- gas station on entering Castro Dozon (KM 24),
- two bars/restaurants in Castro Dozon, first one on the left of main road the second one on the right, at the back of second one is also small market.
CASTRO DOZON - SILLEDA:
- in Ponte Neufe (KM 7) should be market but didn't see it, wasn't searching for it though,
- in A Estacion de tren de Lalin (KM 14) are 2 bars/restaurants and tienda,
- Taberna in A Eirexe (KM 19),
- bar/restaurante on N-525 couple hundred meters after albergue A Laxe (KM 22,5),
- I think there's another taberna soon after Ponte Taboada (KM 27),
- all infrastructure in Silleda.
SILLEDA - PONTE ULLA:
- all infrastructure in Bandeira (KM 7,5),
- albergue/bar Casa Leiras in Dornelas (KM 13),
- there is another bar on CP-2017 near Lagos approx.on KM 19,5, but both times I walked by it was closed,
- Puente Ulla has all infrastructure (KM 23).
Hope that helps, Annie