Marta Tejedor says Blues must stay true to their principles in their crunch game at Solihull Moors (2pm).
The Robins are beset by injuries and were thumped 5-0 by Everton in the FA Cup Fifth Round in midweek.
Blues are one point ahead of their visitors, who are bottom of the Barclays FA WSL, and have a game in hand.
"I think with Bristol of course we will put attention on them and work on some details," said Tejedor. "Some little adaptations depending on the way they play.
"But I don't think we should change our style that much.
"So it is more about reinforcing our principles. The way we should manage and play the game.
"When we played down there as well it was at times a bit of a crazy game on transitions.
"Both teams were putting pressure on the other, especially in the midfield, and were not able to keep the ball for a long time.
"So having good ball possession will give us the confidence to build our attacks.
"We want to focus more on us rather than on them."
Coach Tanya Oxtoby says she is trying to make 'wine out of water' at present.
But Blues have had injury problems of their own all season and will be without England star Lucy Staniforth, who begins a two-game suspension for her dismissal at the FA Cup victory over Sunderland.
Blues appealed the red card but were unsuccessful. Staniforth was sent-off for an incident involving a spectator, who had been abusing her during the game.
"What happened after Lucy's goal was disappointing," said Tejedor.
"For me it is so sad to think that she was going back to her home town, playing against her previous team. The thing is she should have felt like a role model, the girls there looking up to her and the local people feeling proud of her.
"That is the way it should have been instead of bothering her and making her feel bad. I just can't understand it."
Tejedor added: "It is not an ideal situation.
"First of all Lucy is one of the best players we have. That's why she is in the national team. She is a player who can unbalance and change a match herself. She can make a difference. Lucy is a very influential player on team performance.
"Second, I do prefer to be free to choose who plays and not forced by any external circumstance."
Adrienne Jordan and Chloe Arthur had to miss out in the Fifth Round due to concussion.
Neither are certain to be available on Sunday.
Tejedor said: "Adrienne seems to be OK. She has joined in non-contact training. We will see. Chloe, I'm not really sure if we will have her on time."
Blues have become a bogey side for their visitors: Bristol have scored just one goal in their last eight WSL meetings between the two - although that goal was in a 1-0 victory in this fixture last season.
Tickets for Sunday's crunch clash start from just £4 and are available to buy here.